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In spirituality, nondualism, also called non-duality, means "not two" or "one undivided without a second". Nondualism primarily refers to a mature state of consciousness, in which the dichotomy of I-other is 'transcended', and awareness is described as 'centerless' and 'without dichotomies'. Although this state of consciousness may seem to appear spontaneous, it usually is the "result" of prolonged ascetic or meditative/contemplative practice, which includes ethical injunctions. While the term "nondualism" is derived from Advaita Vedanta, descriptions of nondual consciousness can be found within Hinduism (Turiya, sahaja), Buddhism (Buddha-nature, rigpa, shentong), and western Christian and neo-Platonic traditions (henosis, mystical union).

The Asian idea of nondualism developed in the Vedic and post-Vedic Hindu philosophies, as well as in the Buddhist traditions.[3] The oldest traces of nondualism in Indian thought are found as Advaita in the earlier Hindu Upanishads such as Brihadaranyaka Upanishad, as well as other pre-Buddhist Upanishads such as the Chandogya Upanishad, which emphasizes the unity of individual soul called Atman and the Supreme called Brahman. In Hinduism, nondualism has more commonly become associated with the Advaita Vedanta tradition of Adi Shankara.[4]

The Buddhist tradition added the teachings of śūnyatā; the two truths doctrine, the nonduality of the absolute and the relative truth,[5][6] and the Yogachara notion of "mind/thought only" (citta-matra) or "representation-only" (vijñaptimātra).[4] Vijñapti-mātra and the two truths doctrine, coupled with the concept of Buddha-nature, have also been influential concepts in the subsequent development of Mahayana Buddhism, not only in India, but also in China and Tibet, most notably the Chán (Zen) and Dzogchen traditions.

Western Neo-Platonism is an essential element of both Christian contemplation and mysticism, and of Western esotericism and modern spirituality, especially Unitarianism, Transcendentalism, Universalism and Perennialism.

Etymology