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The term subitism points to sudden awakening, the idea that insight into Buddha-nature, or the nature of mind, is "sudden," c.q. "in one glance," "uncovered all together," or "together, completely, simultaneously," in contrast to "successively or being uncovered one after the other." It may be posited as opposite to gradualism, the original Buddhist approach which says that following the dharma can be achieved only step by step, through an arduous practice.
The application of the term "subitism" to Buddhism is derived from the French illumination subite (sudden awakening), contrasting with 'illumination graduelle' (gradual awakening). It gained currency in this use in English from the work of sinologist Paul Demiéville. His 1947 work 'Mirror of the Mind' was widely read in the U.S. It inaugurated a series by him on subitism and gradualism.
The Chinese term tun, as used in tun-wu, translated as "subite," sudden, has a broader meaning than "sudden." It is more apt translated as "in one glance," "uncovered all together," or "together, completely, simultaneously," in contrast to "successively or being uncovered one after the other." It means that all aspects of Buddhist practice are realized, or actualized, simultaneously, and not one after another as in a gradual or linear school curriculum. Specifically, the defilements are not erased gradually, by good works, but simultaneously.
Subitizing, also derived from the Latin adjective subitus, is the rapid, accurate, and confident judgments of numbers performed for small numbers of items. It is important to be aware subitism can also be used in this context.
Tun wu in Chinese Buddhism
Chan
The distinction between sudden and gradual awakening has its roots in Indian Buddhism. It was first introduced in China in the beginning of the 5th century CE by Tao Sheng. The term became of central importance in Chan Buddhism, where it is used to denote the doctrinal position that awakening, the comprehension or realization of the Buddhist teachings, happens simultaneously, and is not the fruit of a gradual accretion or realisation.
Shenhui
In the 8th century the distinction became part of a struggle for influence at the Chinese court by Shenhui, a student of Huineng. Hereafter "sudden enlightenment" became one of the hallmarks of Chan Buddhism, though the sharp distinction was softened by subsequent generations of practitioners.
This softening is reflected in the Platform Sutra of Huineng.
While the Patriarch was living in Bao Lin Monastery, the Grand Master Shen Xiu was preaching in Yu Quan Monastery of Jing Nan. At that time the two Schools, that of Hui Neng of the South and Shen Xiu of the North, flourished side by side. As the two Schools were distinguished from each other by the names "Sudden" (the South) and "Gradual" (the North), the question which sect they should follow baffled certain Buddhist scholars (of that time). (Seeing this), the Patriarch addressed the assembly as follows:
So far as the Dharma is concerned, there can be only one School. (If a distinction exists) it exists in the fact that the founder of one school is a northern man, while the other is a southerner. While there is only one dharma, some disciples realize it more quickly than others. The reason why the names 'Sudden' and 'Gradual' are given is that some disciples are superior to others in mental dispositions. So far as the Dharma is concerned, the distinction of 'Sudden' and 'Gradual' does not exist.
Rivalry between schools
While the socalled "Southern School" was said to place emphasis on sudden enlightenment, it also marked a shift in doctrinal basis from the Laṅkāvatāra Sūtra to the prajnaparamita tradition, especially the Diamond Sutra. The Laṅkāvatāra Sūtra, which endorses the Buddha-nature, emphasized purity of mind, which can be attained in gradations. The Diamond Sutra emphasizes śūnyatā, which "must be realized totally or not at all".
Once this dichotomy was in place, it defined its own logic and rhetorics, which are also recognizable in the distinction between Caodong (Sōtō) and Linji (Rinzai) schools. But it also leads to a "sometimes bitter and always prolix sectarian controversy between later Ch'an and Hua-yen exegetes". In the Huayan classification of teachings, the sudden approach was regarded inferior to the Perfect Teaching of Huayan. Guifeng Zongmi, fifth patriarch of Huayan and Chan master, devised his own classification to counter this subordination. To establish the superiority of Chan, Jinul, the most important figure in the formation of Korean Seon, explained the sudden approach as not pointing to mere emptiness, but to suchness or the dharmadhatu.
Later re-interpretations
Guifeng Zongmi, fifth-generation successor to Shenhui, also softened the edge between sudden and gradual. In his analysis, sudden awakening points to seeing into one's true nature, but is to be followed by a gradual cultivation to attain buddhahood.
This gradual cultivation is also recognized by Dongshan Liangjie, who described the Five Ranks of enlightenment. Other example of depiction of stages on the path are the Ten Bulls, which detail the steps on the Path, The Three Mysterious Gates of Linji, and the Four Ways of Knowing of Hakuin Ekaku. This gradual cultivation is described by Chan Master Sheng Yen as follows:
Ch'an expressions refer to enlightenment as "seeing your self-nature". But even this is not enough. After seeing your self-nature, you need to deepen your experience even further and bring it into maturation. You should have enlightenment experience again and again and support them with continuous practice. Even though Ch'an says that at the time of enlightenment, your outlook is the same as of the Buddha, you are not yet a full Buddha.
Hua-yen
In the Fivefold Classification of the Huayan school and the Five Periods and Eight Teachings of the Tiantai-school the sudden teaching was given a high place, but still inferior to the Complete or Perfect teachings of these schools.
Korean Seon
Chinul, a 12th-century Korean Seon master, followed Zongmi, and also emphasized that insight into our true nature is sudden, but is to be followed by practice to ripen the insight and attain full Buddhahood.
In contemporary Korean Seon, Seongcheol has defended the stance of "sudden insight, sudden cultivation". Citing Taego Bou (太古普愚: 1301-1382) as the true successor of the Linji Yixuan (臨済義玄) line of patriarchs rather than Jinul (知訥: 1158-1210), he advocated Hui Neng's original stance of 'sudden enlightenment, sudden cultivation' (Hangul: 돈오돈수, Hanja: 頓悟頓修) as opposed to Jinul's stance of 'sudden enlightenment, gradual cultivation' (Hangul: 돈오점수, Hanja: 頓悟漸修). Whereas Jinul had initially asserted that with enlightenment comes the need to further one's practice by gradually destroying the karmic vestiges attained through millions of rebirths, Huineng and Seongcheol maintained that with perfect enlightenment, all karmic remnants disappear and one becomes a Buddha immediately.
Popularisation in the west
When Zen was introduced in the west, the Rinzai stories of unconventional masters and sudden enlightenment caught the popular imagination. D. T. Suzuki was a seminal influence in this regard. It was Suzuki's contention that a Zen satori (awakening) was the goal of the tradition's training. As Suzuki portrayed it, Zen Buddhism was a highly practical religion whose emphasis on direct experience made it particularly comparable to forms of mystical experience that scholars such as William James had emphasized as the fountainhead of all religious sentiment.
Indian spirituality
The emphasis on direct experience is also recognized in forms of Indian spirituality, which gained popularity in the west in 1960s and 1970s, and further influenced the discourse on awakening in the west.
Ramana Maharshi - Akrama mukti
Ramana Maharshi made a distinction between akrama mukti, "sudden liberation", as opposed to the krama mukti, "gradual liberation" as in the Vedanta path of jnana yoga:
‘Some people,’ he said, ‘start off by studying literature in their youth. Then they indulge in the pleasures of the world until they are fed up with them. Next, when they are at an advanced age, they turn to books on Vedanta. They go to a guru and get initiated by him and then start the process of sravana, manana and nididhyasana, which finally culminates in samadhi. This is the normal and standard way of approaching liberation. It is called krama mukti [gradual liberation]. But I was overtaken by akrama mukti [sudden liberation] before I passed through any of the above-mentioned stages.’
Inchegeri Sampradaya - "the Ant's way"
The teachings of Bhausaheb Maharaj, the founder of the Inchegeri Sampradaya, have been called "the Ant's way", the way of meditation, while the teachings of Siddharameshwar Maharaj and his disciples Nisargadatta Maharaj and Ranjit Maharaj have been called "the Bird's Way", the direct path to Self-discovery:
The way of meditation is a long arduous path while the Bird's Way is a clear direct path of Self investigation, Self exploration, and using thought or concepts as an aid to understanding and Self-Realization. Sometimes this approach is also called the Reverse Path. What Reverse Path indicates is the turning around of one's attention away from objectivity to the more subjective sense of one's Beingness. With the Bird's Way, first one's mind must be made subtle. This is generally done with some initial meditation on a mantra or phrase which helps the aspirant to step beyond the mental/conceptual body, using a concept to go beyond conceptualization.
The terms appear in the Varaha Upanishad, Chapter IV:
34. (The Rishi) Suka is a Mukta (emancipated person). (The Rishi) Vamadeva is a Mukta. There are no others (who have attained emancipation) than through these (viz., the two paths of these two Rishis). Those brave men who follow the path of Suka in this world become Sadyo-Muktas (viz., emancipated) immediately after (the body wear away);
35. While those who always follow the path of Vamadeva (i.e., Vedanta) in this world are subject again and again to rebirths and attain Krama (gradual) emancipation, through Yoga, Sankhya and Karmas associated with Sattva (Guna).
36. Thus there are two paths laid down by the Lord of Devas (viz.,) the Suka and Vamadeva paths. The Suka path is called the bird’s path; while the Vamadeva path is called the ant’s path.
