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Sunday, September 11, 2022

Idolatry

From Wikipedia, the free encyclopedia

Moses Indignant at the Golden Calf, painting by William Blake, 1799–1800

Idolatry is the worship of a cult image or "idol" as though it were God. In Abrahamic religions (namely Judaism, Samaritanism, Christianity, the Baháʼí Faith, and Islam) idolatry connotes the worship of something or someone other than the Abrahamic god as if it were God. In these monotheistic religions, idolatry has been considered as the "worship of false gods" and is forbidden by texts such as the Ten Commandments. Other monotheistic religions may apply similar rules.

For instance, the phrase false god is a derogatory term used in Abrahamic religions to indicate cult images or deities of non-Abrahamic Pagan religions, as well as other competing entities or objects to which particular importance is attributed. Conversely, followers of animistic and polytheistic religions may regard the gods of various monotheistic religions as "false gods" because they do not believe that any real deity possesses the properties ascribed by monotheists to their sole deity. Atheists, who do not believe in any deities, do not usually use the term false god even though that would encompass all deities from the atheist viewpoint. Usage of this term is generally limited to theists, who choose to worship some deity or deities, but not others.

In many Indian religions, which include both theistic and non-theistic branches of Hinduism, Buddhism, and Jainism, idols (murti) are considered as symbolism for the absolute but not the Absolute, or icons of spiritual ideas, or the embodiment of the divine. It is a means to focus one's religious pursuits and worship (bhakti). In the traditional religions of Ancient Egypt, Greece, Rome, Africa, Asia, the Americas and elsewhere, the reverence of cult images or statues has been a common practice since antiquity, and cult images have carried different meanings and significance in the history of religion. Moreover, the material depiction of a deity or more deities has always played an eminent role in all cultures of the world.

The opposition to the use of any icon or image to represent ideas of reverence or worship is called aniconism. The destruction of images as icons of veneration is called iconoclasm, and this has long been accompanied with violence between religious groups that forbid idol worship and those who have accepted icons, images and statues for veneration. The definition of idolatry has been a contested topic within Abrahamic religions, with many Muslims and most Protestant Christians condemning the Catholic and Eastern Orthodox practice of venerating the Virgin Mary in many churches as a form of idolatry.

The history of religions has been marked with accusations and denials of idolatry. These accusations have considered statues and images to be devoid of symbolism. Alternatively, the topic of idolatry has been a source of disagreements between many religions, or within denominations of various religions, with the presumption that icons of one's own religious practices have meaningful symbolism, while another person's different religious practices do not.

Etymology and nomenclature

Moses breaks the original two stone tablets inscribed with the Ten Commandments in response to the Israelites' worship of the Golden Calf; woodcut by Julius Schnorr von Carolsfeld, 1860.

The term idolatry comes from the Ancient Greek word eidololatria (εἰδωλολατρία), which itself is a compound of two words: eidolon (εἴδωλον "image/idol") and latreia (λατρεία "worship", related to λάτρις). The word eidololatria thus means "worship of idols", which in Latin appears first as idololatria, then in Vulgar Latin as idolatria, therefrom it appears in 12th century Old French as idolatrie, which for the first time in mid 13th century English appears as "idolatry".

Although the Greek appears to be a loan translation of the Hebrew phrase avodat elilim, which is attested in rabbinic literature (e.g., bChul., 13b, Bar.), the Greek term itself is not found in the Septuagint, Philo, Josephus, or in other Hellenistic Jewish writings. The original term used in early rabbinic writings is oved avodah zarah (AAZ, worship in strange service, or "pagan"), while avodat kochavim umazalot (AKUM, worship of planets and constellations) is not found in its early manuscripts. The later Jews used the term עֲבוֹדה זֶרֶה‎, avodh zereh, meaning "strange worship".

Idolatry has also been called idolism, iconolatry, or idolodulia in historic literature.

Prehistoric and ancient civilizations

The earliest so-called Venus figurines have been dated to the prehistoric Upper Paleolithic era (35–40 ka onwards). Archaeological evidence from the islands of the Aegean Sea have yielded Neolithic era Cycladic figures from 4th and 3rd millennium BC, idols in namaste posture from Indus Valley civilization sites from the 3rd millennium BC, and much older petroglyphs around the world show humans began producing sophisticated images. However, because of a lack of historic texts describing these, it is unclear what, if any connection with religious beliefs, these figures had, or whether they had other meaning and uses, even as toys.

The earliest historic records confirming cult images are from the ancient Egyptian civilization, thereafter related to the Greek civilization. By the 2nd millennium BC two broad forms of cult image appear, in one images are zoomorphic (god in the image of animal or animal-human fusion) and in another anthropomorphic (god in the image of man). The former is more commonly found in ancient Egypt influenced beliefs, while the anthropomorphic images are more commonly found in Indo-European cultures. Symbols of nature, useful animals or feared animals may also be included by both. The stelae from 4,000 to 2,500 BC period discovered in France, Ireland through Ukraine, and in Central Asia through South Asia, suggest that the ancient anthropomorphic figures included zoomorphic motifs. In Nordic and Indian subcontinent, bovine (cow, ox, -*gwdus, -*g'ou) motifs or statues, for example, were common. In Ireland, iconic images included pigs.

The Ancient Egyptian religion was polytheistic, with large cult images that were either animals or included animal parts. Ancient Greek civilization preferred human forms, with idealized proportions, for divine representation. The Canaanites of West Asia incorporated a golden calf in their pantheon.

The ancient philosophy and practices of the Greeks, thereafter Romans, were imbued with polytheistic idolatry. They debate what is an image and if the use of image is appropriate. To Plato, images can be a remedy or poison to the human experience. To Aristotle, states Paul Kugler, an image is an appropriate mental intermediary that "bridges between the inner world of the mind and the outer world of material reality", the image is a vehicle between sensation and reason. Idols are useful psychological catalysts, they reflect sense data and pre-existing inner feelings. They are neither the origins nor the destinations of thought but the intermediary in the human inner journey. Fervid opposition to the idolatry of the Greeks and Romans was of Early Christianity and later Islam, as evidenced by the widespread desecration and defacement of ancient Greek and Roman sculptures that have survived into the modern era.

Abrahamic religions

Judaism

This is an image of a copy of the 1675 Ten Commandments, at the Amsterdam Esnoga synagogue, produced on parchment in 1768 by Jekuthiel Sofer, a prolific Jewish scribe in Amsterdam. It has Hebrew language writing in two columns separated between, and surrounded by, ornate flowery patterns.
A 1768 synagogue parchment with the Ten Commandments by Jekuthiel Sofer. Among other things, it prohibits idolatry

Judaism prohibits any form of idolatry even if they are used to worship the one God of Judaism as occurred during the sin of the golden calf. According to the second word of the decalogue, Thou shalt not make unto thee any graven image. The worship of foreign gods in any form or through icons is not allowed.

Many Jewish scholars such as Rabbi Saadia Gaon, Rabbi Bahya ibn Paquda, and Rabbi Yehuda Halevi have elaborated on the issues of idolatry. One of the oft-cited discussions is the commentary of Rabbi Moshe ben Maimon (Maimonides) on idolatry. According to the Maimonidean interpretation, idolatry in itself is not a fundamental sin, but the grave sin is the denial of God's omnipresence that occurs with the belief that God can be corporeal. In the Jewish belief, the only image of God is man, one who lives and thinks; God has no visible shape, and it is absurd to make or worship images; instead man must worship the invisible God alone.

The commandments in the Hebrew Bible against idolatry forbade the practices and gods of ancient Akkad, Mesopotamia, and Egypt. The Hebrew Bible states that God has no shape or form, is utterly incomparable, is everywhere and cannot be represented in a physical form of an idol.

Biblical scholars have historically focused on the textual evidence to construct the history of idolatry in Judaism, a scholarship that post-modern scholars have increasingly begun deconstructing. This biblical polemics, states Naomi Janowitz, a professor of Religious Studies, has distorted the reality of Israelite religious practices and the historic use of images in Judaism. The direct material evidence is more reliable, such as that from the archaeological sites, and this suggests that the Jewish religious practices have been far more complex than what biblical polemics suggest. Judaism included images and cultic statues in the First Temple period, the Second Temple period, Late Antiquity (2nd to 8th century CE), and thereafter. Nonetheless, these sorts of evidence may be simply descriptive of Ancient Israelite practices in some—possibly deviant—circles, but cannot tell us anything about the mainstream religion of the Bible which proscribes idolatry.

The history of Jewish religious practice has included cult images and figurines made of ivory, terracotta, faience and seals. As more material evidence emerged, one proposal has been that Judaism oscillated between idolatry and iconoclasm. However, the dating of the objects and texts suggest that the two theologies and liturgical practices existed simultaneously. The claimed rejection of idolatry because of monotheism found in Jewish literature and therefrom in biblical Christian literature, states Janowitz, has been unreal abstraction and flawed construction of the actual history. The material evidence of images, statues and figurines taken together with the textual description of cherub and "wine standing for blood", for example, suggests that symbolism, making religious images, icon and index has been integral part of Judaism. Every religion has some objects that represent the divine and stand for something in the mind of the faithful, and Judaism too has had its holy objects and symbols such as the Menorah.

Christianity

St. Benedict destroying a pagan idol, by Juan Rizi (1600–1681)

Ideas on idolatry in Christianity are based on the first of Ten Commandments.

You shall have no other gods before me.

This is expressed in the Bible in Exodus 20:3, Matthew 4:10, Luke 4:8 and elsewhere, e.g.:

Ye shall make you no idols nor graven image, neither rear you up a standing image, neither shall ye set up any image of stone in your land, to bow down unto it: for I am the Lord your God. Ye shall keep my sabbaths, and reverence my sanctuary.

— Leviticus 26:1–2, King James Bible

The Christian view of idolatry may generally be divided into two general categories: the Catholic and Eastern Orthodox view which accepts the use of religious images, and the views of many Protestant churches that considerably restrict their use. However, many Protestants have used the image of the cross as a symbol.

Catholicism

The veneration of Mary, Jesus Christ, and the Black Madonna are common practices in the Catholic Church.

The Roman Catholic and particularly the Orthodox Churches have traditionally defended the use of icons. The debate on what images signify and whether reverence with the help of icons in church is equivalent to idolatry has lasted for many centuries, particularly from the 7th century until the Reformation in the 16th century. These debates have supported the inclusion of icons of Jesus Christ, the Virgin Mary, and the Apostles, the iconography expressed in stained glass, regional saints and other symbols of Christian faith. It has also supported the practices such as the Catholic mass, burning of candles before pictures, Christmas decorations and celebrations, and festive or memorial processions with statues of religious significance to Christianity.

St. John of Damascus, in his "On the Divine Image", defended the use of icons and images, in direct response to the Byzantine iconoclasm that began widespread destruction of religious images in the 8th century, with support from emperor Leo III and continued by his successor Constantine V during a period of religious war with the invading Umayyads. John of Damascus wrote, "I venture to draw an image of the invisible God, not as invisible, but as having become visible for our sakes through flesh and blood", adding that images are expressions "for remembrance either of wonder, or an honor, or dishonor, or good, or evil" and that a book is also a written image in another form. He defended the religious use of images based on the Christian doctrine of Jesus as an incarnation.

St. John the Evangelist cited John 1:14, stating that "the Word became flesh" indicates that the invisible God became visible, that God's glory manifested in God's one and only Son as Jesus Christ, and therefore God chose to make the invisible into a visible form, the spiritual incarnated into the material form.

Pope Pius V praying with a crucifix, painting by August Kraus

The early defense of images included exegesis of Old and New Testament. Evidence for the use of religious images is found in Early Christian art and documentary records. For example, the veneration of the tombs and statues of martyrs was common among early Christian communities. In 397 St. Augustine of Hippo, in his Confessions 6.2.2, tells the story of his mother making offerings for the tombs of martyrs and the oratories built in the memory of the saints.

Images function as the Bible
for the illiterate, and
incite people to piety and virtue.

Pope Gregory I, 7th century

The Catholic defense mentions textual evidence of external acts of honor towards icons, arguing that there are a difference between adoration and veneration and that the veneration shown to icons differs entirely from the adoration of God. Citing the Old Testament, these arguments present examples of forms of "veneration" such as in Genesis 33:3, with the argument that "adoration is one thing, and that which is offered in order to venerate something of great excellence is another". These arguments assert, "the honor given to the image is transferred to its prototype", and that venerating an image of Christ does not terminate at the image itself – the material of the image is not the object of worship – rather it goes beyond the image, to the prototype.

According to the Catechism of the Catholic Church:

The Christian veneration of images is not contrary to the first commandment which proscribes idols. Indeed, "the honor rendered to an image passes to its prototype," and "whoever venerates an image venerates the person portrayed in it." The honor paid to sacred images is a "respectful veneration," not the adoration due to God alone:

Religious worship is not directed to images in themselves, considered as mere things, but under their distinctive aspect as images leading us on to God incarnate. The movement toward the image does not terminate in it as image, but tends toward that whose image it is.

It also points out the following:

Idolatry not only refers to false pagan worship. It remains a constant temptation to faith. Idolatry consists in divinizing what is not God. Man commits idolatry whenever he honors and reveres a creature in place of God, whether this be gods or demons (for example, satanism), power, pleasure, race, ancestors, the state, money, etc.

The manufacture of images of Jesus, the Virgin Mary and Christian saints, along with prayers directed to these has been widespread among the Catholic faithful.

Orthodox Church

The Eastern Orthodox Church has differentiated between latria and dulia. A latria is the worship due God, and latria to anyone or anything other than God is doctrinally forbidden by the Orthodox Church; however dulia has been defined as veneration of religious images, statues or icons which is not only allowed but obligatory. This distinction was discussed by Thomas Aquinas in section 3.25 of Summa Theologiae.

The veneration of images of Mary is called Marian devotion (above: Lithuania), a practice questioned in the majority of Protestant Christianity.

In Orthodox apologetic literature, the proper and improper use of images is extensively discussed. Exegetical orthodox literature points to icons and the manufacture by Moses (under God's commandment) of the Bronze Snake in Numbers 21:9, which had the grace and power of God to heal those bitten by real snakes. Similarly, the Ark of the Covenant was cited as evidence of the ritual object above which Yahweh was present.

Veneration of icons through proskynesis was codified in 787 AD by the Seventh Ecumenical Council. This was triggered by the Byzantine Iconoclasm controversy that followed raging Christian-Muslim wars and a period of iconoclasm in West Asia. The defense of images and the role of the Syrian scholar John of Damascus was pivotal during this period. The Eastern Orthodox church has ever since celebrated the use of icons and images. Eastern-rite Catholics also accepts icons in their Divine Liturgy.

Protestantism

The idolatry debate has been one of the defining differences between Papal Catholicism and Anti-papal Protestantism. The anti-papal writers have prominently questioned the worship practices and images supported by Catholics, with many Protestant scholars listing it as the "one religious error larger than all others". The sub-list of erring practices have included among other things the veneration of Virgin Mary, the Catholic mass, the invocation of saints, and the reverence expected for and expressed to Pope himself. The charges of supposed idolatry against the Roman Catholics were leveled by a diverse group of Protestants, from Anglicans to Calvinists in Geneva.

Altar with Christian Bible and crucifix on it, in a Lutheran Protestant church

Protestants did not abandon all icons and symbols of Christianity. They typically avoid the use of images, except the cross, in any context suggestive of veneration. The cross remained their central icon. Technically both major branches of Christianity have had their icons, states Carlos Eire, a professor of religious studies and history, but its meaning has been different to each and "one man's devotion was another man's idolatry". This was particularly true not only in the intra-Christian debate, states Eire, but also when soldiers of Catholic kings replaced "horrible Aztec idols" in the American colonies with "beautiful crosses and images of Mary and the saints".

Protestants often accuse Catholics of idolatry, iconolatry, and even paganism; in the Protestant Reformation such language was common to all Protestants. In some cases, such as the Puritan groups denounced all forms of religious objects, whether in three-dimensional or two-dimensional form, including the Christian cross.

The body of Christ on the cross is an ancient symbol used within the Catholic, Eastern Orthodox, Anglican, and Lutheran churches, in contrast with some Protestant groups, which use only a simple cross. In Judaism, the reverence to the icon of Christ in the form of cross has been seen as idolatry. However, some Jewish scholars disagree and consider Christianity to be based on Jewish belief and not truly idolatrous.

Islam

In Islamic sources, the concept of shirk (triliteral root: sh-r-k) can refer to "idolatry", though it is most widely used to denote "association of partners with God". The concept of Kufr (k-f-r) can also include idolatry (among other forms of disbelief). The one who practices shirk is called mushrik (plural mushrikun) in the Islamic scriptures. The Quran forbids idolatry. Over 500 mentions of kufr and shirk are found in the Quran, and both concepts are strongly forbidden.

The Islamic concept of idolatry extends beyond polytheism, and includes some Christians and Jews as muširkūn (idolaters) and kafirun (infidels). For example:

Those who say, “Allah is the Messiah, son of Mary,” have certainly fallen into disbelief. The Messiah ˹himself˺ said, “O Children of Israel! Worship Allah—my Lord and your Lord.” Whoever associates others with Allah ˹in worship˺ will surely be forbidden Paradise by Allah. Their home will be the Fire. And the wrongdoers will have no helpers.

Shia classical theology differs in the concept of Shirk. According to Twelver theologians, the attributes and names of God have no independent and hypostatic existence apart from the being and essence of God. Any suggestion of these attributes and names being conceived of as separate is thought to entail polytheism. It would be even incorrect to say God knows by his knowledge which is in his essence but God knows by his knowledge which is his essence. Also God has no physical form and he is insensible. The border between theoretical Tawhid and Shirk is to know that every reality and being in its essence, attributes and action are from him (from Him-ness), it is Tawhid. Every supernatural action of the prophets is by God's permission as Quran points to it. The border between the Tawhid and Shirk in practice is to assume something as an end in itself, independent from God, not as a road to God (to Him-ness). Ismailis go deeper into the definition of Shirk, declaring they don't recognize any sort of ground of being by the esoteric potential to have intuitive knowledge of the human being. Hence, most Shias have no problem with religious symbols and artworks, and with reverence for Walis, Rasūls and Imams.

Islam strongly prohibits all form of idolatry, which is part of the sin of shirk (Arabic: شرك); širk comes from the Arabic root Š-R-K (ش ر ك), with the general meaning of "to share". In the context of the Qur'an, the particular sense of "sharing as an equal partner" is usually understood as "attributing a partner to Allah". Shirk is often translated as idolatry and polytheism. In the Qur'an, shirk and the related word (plural Stem IV active participle) mušrikūn (مشركون) "those who commit shirk" often refers to the enemies of Islam (as in verse 9.1–15) but sometimes it also refers to erring Muslims.

Within Islam, shirk is sin that can only be forgiven if the person who commits it asks God for forgiveness; if the person who committed it dies without repenting God may forgive any sin except for committing shirk. In practice, especially among strict conservative interpretations of Islam, the term has been greatly extended and means deification of anyone or anything other than the singular God. In Salafi-Wahhabi interpretation, it may be used very widely to describe behaviour that does not literally constitute worship, including use of images of sentient beings, building a structure over a grave, associating partners with God, giving his characteristics to others beside him, or not believing in his characteristics. 19th century Wahhabis regarded idolatry punishable with the death penalty, a practice that was "hitherto unknown" in Islam. However, Classical Orthodox Sunni thought used to be rich in Relics and Saint veneration, as well as pilgrimage to their shrines. Ibn Taymiyya, a medieval theologian that influenced modern days Salafists, was put in prison for his negation of veneration of relics and Saints, as well as pilgrimage to Shrines, which was considered unorthodox by his contemporary theologians.

According to Islamic tradition, over the millennia after Ishmael's death, his progeny and the local tribes who settled around the oasis of Zam-Zam gradually turned to polytheism and idolatry. Several idols were placed within the Kaaba representing deities of different aspects of nature and different tribes. Several heretical rituals were adopted in the Pilgrimage (Hajj) including doing naked circumambulation.

In her book, Islam: A Short History, Karen Armstrong asserts that the Kaaba was officially dedicated to Hubal, a Nabatean deity, and contained 360 idols that probably represented the days of the year. But by Muhammad's day, it seems that the Kaaba was venerated as the shrine of Allah, the High God. Allah was never represented by an idol. Once a year, tribes from all around the Arabian peninsula, whether Christian or pagan, would converge on Mecca to perform the Hajj, marking the widespread conviction that Allah was the same deity worshiped by monotheists. Guillaume in his translation of Ibn Ishaq, an early biographer of Muhammad, says the Ka'aba might have been itself addressed using a feminine grammatical form by the Quraysh. Circumambulation was often performed naked by men and almost naked by women, It is disputed whether Allah and Hubal were the same deity or different. Per a hypothesis by Uri Rubin and Christian Robin, Hubal was only venerated by Quraysh and the Kaaba was first dedicated to Allah, a supreme god of individuals belonging to different tribes, while the pantheon of the gods of Quraysh was installed in Kaaba after they conquered Mecca a century before Muhammad's time.

Indian religions

The oldest forms of the ancient religions of India apparently made no use of cult images. While the Vedic literature leading up to Hinduism is extensive, in the form of Samhitas, Brahmanas, Aranyakas and Upanishads, and has been dated to have been composed over a period of centuries (1200 BC to 200 BC), historical Vedic religion appears not to have used cult images up to around 500 BC at least. The early Buddhist and Jain (pre-200 BC) traditions suggest no evidence of idolatry. The Vedic literature mentions many gods and goddesses, as well as the use of Homa (votive ritual using fire), but it does not mention images or their worship. The ancient Buddhist, Hindu and Jaina texts discuss the nature of existence, whether there is or is not a creator deity such as in the Nasadiya Sukta of the Rigveda, they describe meditation, they recommend the pursuit of simple monastic life and self-knowledge, they debate the nature of absolute reality as Brahman or Śūnyatā, yet the ancient Indian texts mention no use of images. Indologists such as the Max Muller, Jan Gonda, Pandurang Vaman Kane, Ramchandra Narayan Dandekar, Horace Hayman Wilson, Stephanie Jamison and other scholars state that "there is no evidence for icons or images representing god(s)" in the ancient religions of India. Use of cult images developed among the Indian religions later, perhaps first in Buddhism, where large images of the Buddha appear by the 1st century AD.

According to John Grimes, a professor of Indian philosophy, Indian thought denied even dogmatic idolatry of its scriptures. Everything has been left to challenge, arguments and enquiry, with the medieval Indian scholar Vācaspati Miśra stating that not all scripture is authoritative, only scripture which "reveals the identity of the individual self and the supreme self as the non-dual Absolute".

Buddhism

Buddhists praying before a statue in Tibet (top) and Vietnam.

According to Eric Reinders, icons and idolatry have been an integral part of Buddhism throughout its later history. Buddhists, from Korea to Vietnam, Thailand to Tibet, Central Asia to South Asia, have long produced temples and idols, altars and rosaries, relics to amulets, images to ritual implements. The images or relics of Buddha are found in all Buddhist traditions, but they also feature gods and goddesses such as those in Tibetan Buddhism.

Bhakti (called Bhatti in Pali) has been a common practice in Theravada Buddhism, where offerings and group prayers are made to Cetiya and particularly images of Buddha. Karel Werner notes that Bhakti has been a significant practice in Theravada Buddhism, and states, "there can be no doubt that deep devotion or bhakti / bhatti does exist in Buddhism and that it had its beginnings in the earliest days".

According to Peter Harvey – a professor of Buddhist Studies, Buddha idols and idolatry spread into northwest Indian subcontinent (now Pakistan and Afghanistan) and into Central Asia with Buddhist Silk Road merchants. The Hindu rulers of different Indian dynasties patronized both Buddhism and Hinduism from 4th to 9th century, building Buddhist icons and cave temples such as the Ajanta Caves and Ellora Caves which featured Buddha idols. From the 10th century, states Harvey, the raids into northwestern parts of South Asia by Muslim Turks destroyed Buddhist idols, given their religious dislike for idolatry. The iconoclasm was so linked to Buddhism, that the Islamic texts of this era in India called all idols as Budd. The desecration of idols in cave temples continued through the 17th century, states Geri Malandra, from the offense of "the graphic, anthropomorphic imagery of Hindu and Buddhist shrines".

In East Asia and Southeast Asia, worship in Buddhist temples with the aid of icons and sacred objects has been historic. In Japanese Buddhism, for example, Butsugu (sacred objects) have been integral to the worship of the Buddha (kuyo), and such idolatry considered a part of the process of realizing one's Buddha nature. This process is more than meditation, it has traditionally included devotional rituals (butsudo) aided by the Buddhist clergy. These practices are also found in Korea and China.

Hinduism

Ganesh statue during a contemporary festival (left), and Bhakti saint Meera singing before an image of Krishna.

In Hinduism, an icon, image or statue is called Murti or Pratima. Major Hindu traditions such as Vaishnavism, Shaivism, Shaktism and Smartaism favor the use of Murti (idol). These traditions suggest that it is easier to dedicate time and focus on spirituality through anthropomorphic or non-anthropomorphic icons. The Bhagavad Gita – a Hindu scripture, in verse 12.5, states that only a few have the time and mind to ponder and fix on the unmanifested Absolute (abstract formless Brahman), and it is much easier to focus on qualities, virtues, aspects of a manifested representation of god, through one's senses, emotions and heart, because the way human beings naturally are.

A murti in Hinduism, states Jeaneane Fowler – a professor of Religious Studies specializing on Indian Religions, is itself not god, it is an "image of god" and thus a symbol and representation. A Murti is a form and manifestation, states Fowler, of the formless Absolute. Thus a literal translation of Murti as idol is incorrect, when idol is understood as superstitious end in itself. Just like the photograph of a person is not the real person, a Murti is an image in Hinduism but not the real thing, but in both cases the image reminds of something of emotional and real value to the viewer. When a person worships a Murti, it is assumed to be a manifestation of the essence or spirit of the deity, the worshipper's spiritual ideas and needs are meditated through it, yet the idea of ultimate reality – called Brahman in Hinduism – is not confined in it.

Devotional (bhakti movement) practices centered on cultivating a deep and personal bond of love with God, often expressed and facilitated with one or more Murti, and includes individual or community hymns, japa or singing (bhajan, kirtan or aarti). Acts of devotion, in major temples particularly, are structured on treating the Murti as the manifestation of a revered guest, and the daily routine can include awakening the murti in the morning and making sure that it "is washed, dressed, and garlanded."

In Vaishnavism, the building of a temple for the murti is considered an act of devotion, but non-Murti symbolism is also common wherein the aromatic Tulsi plant or Saligrama is an aniconic reminder of the spiritualism in Vishnu. In the Shaivism tradition of Hinduism, Shiva may be represented as a masculine idol, or half-man half woman ardhanarishvara form, in an anicon Linga-Yoni form. The worship rituals associated with the Murti, correspond to ancient cultural practices for a beloved guest, and the Murti is welcomed, taken care of, and then requested to retire.

Christopher John Fuller states that an image in Hinduism cannot be equated with a deity and the object of worship is the divine whose power is inside the image, and the image is not the object of worship itself, Hindus believe everything is worthy of worship as it contains divine energy. The idols are neither random nor intended as superstitious objects, rather they are designed with embedded symbolism and iconographic rules which sets the style, proportions, the colors, the nature of items the images carry, their mudra and the legends associated with the deity. The Vāstusūtra Upaniṣad states that the aim of the Murti art is to inspire a devotee towards contemplating the Ultimate Supreme Principle (Brahman). This text adds (abridged):

From the contemplation of images grows delight, from delight faith, from faith steadfast devotion, through such devotion arises that higher understanding (parāvidyā) that is the royal road to moksha. Without the guidance of images, the mind of the devotee may go ashtray and form wrong imaginations. Images dispel false imaginations. (... ) It is in the mind of Rishis (sages), who see and have the power of discerning the essence of all created things of manifested forms. They see their different characters, the divine and the demoniac, the creative and the destructive forces, in their eternal interplay. It is this vision of Rishis, of gigantic drama of cosmic powers in eternal conflict, which the Sthapakas (Silpins, murti and temple artists) drew the subject-matter for their work.

— Pippalada, Vāstusūtra Upaniṣad, Introduction by Alice Boner et al.

Some Hindu movements founded during the colonial era, such as the Arya Samaj and Satya Mahima Dharma reject idolatry.

Jainism

An expression of reverence to Gomateshwara statue in Jainism.

Devotional idolatry has been a prevalent ancient practice in various Jaina sects, wherein learned Tirthankara (Jina) and human gurus have been venerated with offerings, songs and Āratī prayers. Like other major Indian religions, Jainism has premised its spiritual practices on the belief that "all knowledge is inevitably mediated by images" and human beings discover, learn and know what is to be known through "names, images and representations". Thus, idolatry has been a part of the major sects of Jainism such as Digambara and Shvetambara. The earliest archaeological evidence of the idols and images in Jainism is from Mathura, and has been dated to be from the first half of the 1st millennium AD.

The creation of idols, their consecration, the inclusion of Jaina layperson in idols and temples of Jainism by the Jaina monks has been a historic practice. However, during the iconoclastic era of Islamic rule, between the 15th and 17th century, a Lonka sect of Jainism emerged that continued pursuing their traditional spirituality but without the Jaina arts, images and idols.

Sikhism

Sikhism is a monotheistic Indian religion, and Sikh temples are devoid of idols and icons for God. Yet, Sikhism strongly encourages devotion to God. Some scholars call Sikhism a Bhakti sect of Indian traditions.

In Sikhism, "nirguni Bhakti" is emphasised – devotion to a divine without Gunas (qualities or form), but its scripture also accepts representations of God with formless (nirguni) and with form (saguni), as stated in Adi Granth 287. Sikhism condemns worshipping images or statues as if it were God, but have historically challenged the iconoclastic policies and Hindu temple destruction activities of Islamic rulers in India. Sikhs house their scripture and revere the Guru Granth Sahib as the final Guru of Sikhism. It is installed in Sikh Gurdwara (temple), many Sikhs bow or prostrate before it on entering the temple. Guru Granth Sahib is ritually installed every morning, and put to bed at night in many Gurdwaras. In the Dasam Bani, Guru Gobind Singh wrote "I am idol-breaker" on line 95 of his Zafarnamah.

Traditional religions

Africa

An Orisha deity (left) and an artwork depicting a kneeling female worshipper with child, by Yoruba people.

Africa has numerous ethnic groups, and their diverse religious idea have been grouped as African Traditional Religions, sometimes abbreviated to ATR. These religions typically believe in a Supreme Being which goes by different regional names, as well as spirit world often linked to ancestors, and mystical magical powers through divination. Idols and their worship have been associated with all three components in the African Traditional Religions.

According to J.O. Awolalu, proselytizing Christians and Muslims have mislabelled idol to mean false god, when in the reality of most traditions of Africa, the object may be a piece of wood or iron or stone, yet it is "symbolic, an emblem and implies the spiritual idea which is worshipped". The material objects may decay or get destroyed, the emblem may crumble or substituted, but the spiritual idea that it represents to the heart and mind of an African traditionalist remains unchanged. Sylvester Johnson – a professor of African American and Religious Studies, concurs with Awolalu, and states that the colonial era missionaries who arrived in Africa, neither understood the regional languages nor the African theology, and interpreted the images and ritualism as "epitome of idolatry", projecting the iconoclastic controversies in Europe they grew up with, onto Africa.

First with the arrival of Islam in Africa, then during the Christian colonial efforts, the religiously justified wars, the colonial portrayal of idolatry as proof of savagery, the destruction of idols and the seizure of idolaters as slaves marked a long period of religious intolerance, which supported religious violence and demeaning caricature of the African Traditional Religionists. The violence against idolaters and idolatry of Traditional Religion practicers of Africa started in the medieval era and continued into the modern era. The charge of idolatry by proselytizers, state Michael Wayne Cole and Rebecca Zorach, served to demonize and dehumanize local African populations, and justify their enslavement and abuse locally or far off plantations, settlements or for forced domestic labor.

Americas

Inti Raymi, a winter solstice festival of the Inca people, reveres Inti – the sun deity. Offerings include round bread and maize beer.

Statues, images and temples have been a part of the Traditional Religions of the indigenous people of the Americas. The Incan, Mayan and Aztec civilizations developed sophisticated religious practices that incorporated idols and religious arts. The Inca culture, for example, has believed in Viracocha (also called Pachacutec) as the creator deity and nature deities such as Inti (sun deity), and Mama Cocha the goddess of the sea, lakes, rivers and waters.

The Aztec Tula Atlantean statues (above) have been called as symbols of idolatry, but may have just been stone images of warriors.

In Mayan culture, Kukulkan has been the supreme creator deity, also revered as the god of reincarnation, water, fertility and wind. The Mayan people built step pyramid temples to honor Kukulkan, aligning them to the Sun's position on the spring equinox. Other deities found at Mayan archaeological sites include Xib Chac – the benevolent male rain deity, and Ixchel – the benevolent female earth, weaving and pregnancy goddess. A deity with aspects similar to Kulkulkan in the Aztec culture has been called Quetzalcoatl.

Missionaries came to the Americas with the start of Spanish colonial era, and the Catholic Church did not tolerate any form of native idolatry, preferring that the icons and images of Jesus and Mary replace the native idols. Aztec, for example, had a written history which included those about their Traditional Religion, but the Spanish colonialists destroyed this written history in their zeal to end what they considered as idolatry, and to convert the Aztecs to Catholicism. The Aztec Indians, however, preserved their religion and religious practices by burying their idols under the crosses, and then continuing their idol worship rituals and practices, aided by the syncretic composite of atrial crosses and their idols as before.

During and after the imposition of Catholic Christianity during Spanish colonialism, the Incan people retained their original beliefs in deities through syncretism, where they overlay the Christian God and teachings over their original beliefs and practices. The male deity Inti became accepted as the Christian God, but the Andean rituals centered around idolatry of Incan deities have been retained and continued thereafter into the modern era by the Incan people.

Polynesia

The Polynesian people have had a range of polytheistic theologies found across the Pacific Ocean. The Polynesian people produced idols from wood, and congregated around these idols for worship.

The Christian missionaries, particularly from the London Missionary Society such as John Williams, and others such as the Methodist Missionary Society, characterized these as idolatry, in the sense of islanders worshipping false gods. They sent back reports which primarily focussed on "overthrow of pagan idolatry" as evidence of their Christian sects triumph, with fewer mentions of actual converts and baptism.

Religious tolerance and intolerance

The term false god is often used throughout the Abrahamic scriptures (Torah, Tanakh, Bible, and Quran) to compare Yahweh (interpreted by Jews, Samaritans, and Christians) or Elohim/Allah (interpreted by Muslims) as the only true God. Nevertheless, the Hebrew Bible/Old Testament itself recognizes and reports that originally the Israelites were not monotheists but actively engaged in idolatry and worshipped many foreign, non-Jewish Gods besides Yahweh and/or instead of him, such as Baal, Astarte, Asherah, Chemosh, Dagon, Moloch, Tammuz, and more, and continued to do so until their return from the Babylonian exile (see Ancient Hebrew religion). Judaism, the oldest Abrahamic religion, eventually shifted into a strict, exclusive monotheism, based on the sole veneration of Yahweh, the predecessor to the Abrahamic conception of God.

The vast majority of religions in history have been and/or are still polytheistic, worshipping many diverse deities. Moreover, the material depiction of a deity or more deities has always played an eminent role in all cultures of the world. The claim to worship the "one and only true God" came to most of the world with the arrival of Abrahamic religions and is the distinguishing characteristic of their monotheistic worldview, whereas virtually all the other religions in the world have been and/or are still animistic and polytheistic.

The accusations and presumption that all idols and images are devoid of symbolism, or that icons of one's own religion are "true, healthy, uplifting, beautiful symbolism, mark of devotion, divine", while of other person's religion are "false, an illness, superstitious, grotesque madness, evil addiction, satanic, and cause of all incivility" is more a matter of subjective personal interpretation, rather than objective impersonal truth. Regina Schwartz and some other contemporary scholars state allegations that idols only represent false gods, followed by iconoclastic destruction is only little more than religious intolerance. The Scottish Enlightenment philosopher David Hume wrote in his essay Dialogues Concerning Natural Religion (1779) that the worship of different gods and cult images in Pagan religions is premised on religious pluralism, tolerance, and acceptance of diverse representations of the divine, whereas Abrahamic monotheistic religions are intolerant, have attempted to destroy freedom of expression, and have violently forced others to accept and worship their conception of God.

Ultra-high vacuum

From Wikipedia, the free encyclopedia

Ultra-high vacuum (UHV) is the vacuum regime characterised by pressures lower than about 100 nanopascals (1.0×10−7 Pa; 1.0×10−9 mbar; 7.5×10−10 Torr). UHV conditions are created by pumping the gas out of a UHV chamber. At these low pressures the mean free path of a gas molecule is greater than approximately 40 km, so the gas is in free molecular flow, and gas molecules will collide with the chamber walls many times before colliding with each other. Almost all molecular interactions therefore take place on various surfaces in the chamber.

UHV conditions are integral to scientific research. Surface science experiments often require a chemically clean sample surface with the absence of any unwanted adsorbates. Surface analysis tools such as X-ray photoelectron spectroscopy and low energy ion scattering require UHV conditions for the transmission of electron or ion beams. For the same reason, beam pipes in particle accelerators such as the Large Hadron Collider are kept at UHV.

Overview

Maintaining UHV conditions requires the use of unusual materials for equipment. Useful concepts for UHV include:

Typically, UHV requires:

  • High pumping speed — possibly multiple vacuum pumps in series and/or parallel
  • Minimized surface area in the chamber
  • High conductance tubing to pumps — short and fat, without obstruction
  • Use of low-outgassing materials such as certain stainless steels
  • Avoid creating pits of trapped gas behind bolts, welding voids, etc.
  • Electropolishing of all metal parts after machining or welding
  • Use of low vapor pressure materials (ceramics, glass, metals, teflon if unbaked)
  • Baking of the system to remove water or hydrocarbons adsorbed to the walls
  • Chilling of chamber walls to cryogenic temperatures during use
  • Avoiding all traces of hydrocarbons, including skin oils in a fingerprint — always use gloves

Hydrogen and carbon monoxide are the most common background gases in a well-designed, well-baked UHV system. Both Hydrogen and CO diffuse out from the grain boundaries in stainless steel. Helium could diffuse through the steel and glass from the outside air, but this effect is usually negligible due to the low abundance of He in the atmosphere.

Measurement

Pressure

Measurement of high vacuum is done using a nonabsolute gauge that measures a pressure-related property of the vacuum, for example, its thermal conductivity. See, for example, Pacey. These gauges must be calibrated. The gauges capable of measuring the lowest pressures are magnetic gauges based upon the pressure dependence of the current in a spontaneous gas discharge in intersecting electric and magnetic fields.

UHV pressures are measured with an ion gauge, either of the hot filament or inverted magnetron type.

Leak rate

In any vacuum system, some gas will continue to escape into the chamber over time and slowly increase the pressure if it is not pumped out. This leak rate is usually measured in mbar L/s or torr L/s. While some gas release is inevitable, if the leak rate is too high, it can slow down or even prevent the system from reaching low pressure.

There are a variety of possible reasons for an increase in pressure. These include simple air leaks, virtual leaks, and desorption (either from surfaces or volume). A variety of methods for leak detection exist. Large leaks can be found by pressurizing the chamber, and looking for bubbles in soapy water, while tiny leaks can require more sensitive methods, up to using a tracer gas and specialized Helium mass spectrometer.

Outgassing

Outgassing is a problem for UHV systems. Outgassing can occur from two sources: surfaces and bulk materials. Outgassing from bulk materials is minimized by selection of materials with low vapor pressures (such as glass, stainless steel, and ceramics) for everything inside the system. Materials which are not generally considered absorbent can outgas, including most plastics and some metals. For example, vessels lined with a highly gas-permeable material such as palladium (which is a high-capacity hydrogen sponge) create special outgassing problems.

Outgassing from surfaces is a subtler problem. At extremely low pressures, more gas molecules are adsorbed on the walls than are floating in the chamber, so the total surface area inside a chamber is more important than its volume for reaching UHV. Water is a significant source of outgassing because a thin layer of water vapor rapidly adsorbs to everything whenever the chamber is opened to air. Water evaporates from surfaces too slowly to be fully removed at room temperature, but just fast enough to present a continuous level of background contamination. Removal of water and similar gases generally requires baking the UHV system at 200 to 400 °C (392 to 752 °F) while vacuum pumps are running. During chamber use, the walls of the chamber may be chilled using liquid nitrogen to reduce outgassing further.

Bake-out

In order to reach low pressures, it is often useful to heat the entire system above 100 °C (212 °F) for many hours (a process known as bake-out) to remove water and other trace gases which adsorb on the surfaces of the chamber. This may also be required upon "cycling" the equipment to atmosphere. This process significantly speeds up the process of outgassing, allowing low pressures to be reached much faster. After baking, to prevent humidity from getting back into the system after it is exposed to atmospheric pressure, a nitrogen gas flow that creates a small positive pressure can be maintained to keep the system dry.

System design

Pumping

There is no single vacuum pump that can operate all the way from atmospheric pressure to ultra-high vacuum. Instead, a series of different pumps is used, according to the appropriate pressure range for each pump. In the first stage, a roughing pump clears most of the gas from the chamber. This is followed by one or more vacuum pumps that operate at low pressures. Pumps commonly used in this second stage to achieve UHV include:

Turbo pumps and diffusion pumps rely on supersonic attack upon system molecules by the blades and high speed vapor stream, respectively.

Airlocks

To save time, energy, and integrity of the UHV volume an airlock or load-lock vacuum system is often used. The airlock volume has one door or valve, such as a gate valve or UHV angle valve, facing the UHV side of the volume, and another door against atmospheric pressure through which samples or workpieces are initially introduced. After sample introduction and assuring that the door against atmosphere is closed, the airlock volume is typically pumped down to a medium-high vacuum. In some cases the workpiece itself is baked out or otherwise pre-cleaned under this medium-high vacuum. The gateway to the UHV chamber is then opened, the workpiece transferred to the UHV by robotic means or by other contrivance if necessary, and the UHV valve re-closed. While the initial workpiece is being processed under UHV, a subsequent sample can be introduced into the airlock volume, pre-cleaned, and so-on and so-forth, saving much time. Although a "puff" of gas is generally released into the UHV system when the valve to the airlock volume is opened, the UHV system pumps can generally snatch this gas away before it has time to adsorb onto the UHV surfaces. In a system well designed with suitable airlocks, the UHV components seldom need bakeout and the UHV may improve over time even as workpieces are introduced and removed.

Seals

Metal seals, with knife edges on both sides cutting into a soft, copper gasket are employed. This metal-to-metal seal can maintain pressures down to 100 pPa (7.5×10−13 Torr). Although generally considered single use, the skilled operator can obtain several uses through the use of feeler gauges of decreasing size with each iteration, as long as the knife edges are in perfect condition. For SRF cavities, indium seals are more commonly used in sealing two flat surfaces together using clamps to bring the surfaces together. The clamps need to be tightened slowly to ensure the indium seals compress uniformly all around.

Material limitations

Many common materials are used sparingly if at all due to high vapor pressure, high adsorptivity or absorptivity resulting in subsequent troublesome outgassing, or high permeability in the face of differential pressure (i.e.: "through-gassing"):

  • The majority of organic compounds cannot be used:
    • Plastics, other than PTFE and PEEK: plastics in other uses are replaced with ceramics or metals. Limited use of fluoroelastomers (such as Viton) and perfluoroelastomers (such as Kalrez) as gasket materials can be considered if metal gaskets are inconvenient, though these polymers can be expensive. Although through-gassing of elastomerics can not be avoided, experiments have shown that slow out-gassing of water vapor is, initially at least, the more important limitation. This effect can be minimized by pre-baking under medium vacuum. When selecting O-rings, permeation rate and permeation coefficients need to be considered. For example the penetration rate of nitrogen in Viton seals is 100 times lower than the penetration of nitrogen in silicon seals, which impacts the ultimate vacuum that can be achieved. 
    • Glues: special glues for high vacuum must be used, generally epoxies with a high mineral filler content. Among the most popular of these include asbestos in the formulation. This allows for an epoxy with good initial properties and able to retain reasonable performance across multiple bake-outs.
  • Some steels: due to oxidization of carbon steel, which greatly increases adsorption area, only stainless steel is used. Particularly, non-leaded and low-sulfur austenitic grades such as 304 and 316 are preferred. These steels include at least 18% chromium and 8% nickel. Variants of stainless steel include low-carbon grades (such as 304L and 316L), and grades with additives such as niobium and molybdenum to reduce the formation of chromium carbide (which provides no corrosion resistance). Common designations include 316L (low carbon), and 316LN (low carbon with nitrogen), which can boast a significantly lower magnetic permeability with special welding techniques making them preferable for particle accelerator applications. Chromium carbide precipitation at the grain boundaries can render a stainless steel less resistant to oxidation.
  • Lead: Soldering is performed using lead-free solder. Occasionally pure lead is used as a gasket material between flat surfaces in lieu of a copper/knife edge system.
  • Indium: Indium is sometimes used as a deformable gasket material for vacuum seals, especially in cryogenic apparatus, but its low melting point prevents use in baked systems. In a more esoteric application, the low melting point of Indium is taken advantage of as a renewable seal in high vacuum valves. These valves are used several times, generally with the aid of a torque wrench set to increasing torque with each iteration. When the indium seal is exhausted, it is melted and reforms itself and thus is ready for another round of uses.
  • Zinc, cadmium: High vapor pressures during system bake-out virtually preclude their use.
  • Aluminum: Although aluminum itself has a vapor pressure which makes it unsuitable for use in UHV systems, the same oxides which protect aluminum against corrosion improve its characteristics under UHV. Although initial experiments with aluminum suggested milling under mineral oil to maintain a thin, consistent layer of oxide, it has become increasingly accepted that aluminum is a suitable UHV material without special preparation. Paradoxically, aluminum oxide, especially when embedded as particles in stainless steel as for example from sanding in an attempt to reduce the surface area of the steel, is considered a problematic contaminant.
  • Cleaning is very important for UHV. Common cleaning procedures include degreasing with detergents, organic solvents, or chlorinated hydrocarbons. Electropolishing is often used to reduce the surface area from which adsorbed gases can be emitted. Etching of stainless steel using hydrofluoric and nitric acid forms a chromium rich surface, followed by a nitric acid passivation step, which forms a chromium oxide rich surface. This surface retards the diffusion of hydrogen into the chamber.

Technical limitations:

  • Screws: Threads have a high surface area and tend to "trap" gases, and therefore, are avoided. Blind holes are especially avoided, due to the trapped gas at the base of the screw and slow venting through the threads, which is commonly known as a "virtual leak". This can be mitigated by designing components to include through-holes for all threaded connections, or by using vented screws (which have a hole drilled through their central axis or a notch along the threads). Vented Screws allow trapped gases to flow freely from the base of the screw, eliminating virtual leaks and speeding up the pump-down process.
  • Welding: Processes such as gas metal arc welding and shielded metal arc welding cannot be used, due to the deposition of impure material and potential introduction of voids or porosity. Gas tungsten arc welding (with an appropriate heat profile and properly selected filler material) is necessary. Other clean processes, such as electron beam welding or laser beam welding, are also acceptable; however, those that involve potential slag inclusions (such as submerged arc welding and flux-cored arc welding) are obviously not. To avoid trapping gas or high vapor pressure molecules, welds must fully penetrate the joint or be made from the interior surface, otherwise a virtual leak might appear.

UHV manipulator

A UHV manipulator allows an object which is inside a vacuum chamber and under vacuum to be mechanically positioned. It may provide rotary motion, linear motion, or a combination of both. The most complex devices give motion in three axes and rotations around two of those axes. To generate the mechanical movement inside the chamber, three basic mechanisms are commonly employed: a mechanical coupling through the vacuum wall (using a vacuum-tight seal around the coupling: a welded metal bellows for example), a magnetic coupling that transfers motion from air-side to vacuum-side: or a sliding seal using special greases of very low vapor pressure or ferromagnetic fluid. Such special greases can exceed USD $400 per kilogram. Various forms of motion control are available for manipulators, such as knobs, handwheels, motors, stepping motors, piezoelectric motors, and pneumatics. The use of motors in a vacuum environment often requires special design or other special considerations, as the convective cooling taken for granted under atmospheric conditions is not available in a UHV environment.

The manipulator or sample holder may include features that allow additional control and testing of a sample, such as the ability to apply heat, cooling, voltage, or a magnetic field. Sample heating can be accomplished by electron bombardment or thermal radiation. For electron bombardment, the sample holder is equipped with a filament which emits electrons when biased at a high negative potential. The impact of the electrons bombarding the sample at high energy causes it to heat. For thermal radiation, a filament is mounted close to the sample and resistively heated to high temperature. The infrared energy from the filament heats the sample.

Typical uses

Ultra-high vacuum is necessary for many surface analytic techniques such as:

UHV is necessary for these applications to reduce surface contamination, by reducing the number of molecules reaching the sample over a given time period. At 0.1 millipascals (7.5×10−7 Torr), it only takes 1 second to cover a surface with a contaminant, so much lower pressures are needed for long experiments.

UHV is also required for:

Delayed-choice quantum eraser

From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser A delayed-cho...