Non-duality

Non-duality is the philosophical and religious view that reality is not finally divided into separate things, and above all that a person's true self and ultimate reality are not two. Its classic form is the Indian school of Advaita Vedanta, and related ideas appear in Mahāyāna Buddhism and Kashmir Śaivism.

The word

The Sanskrit advaita is usually translated "non-dualism", though the Internet Encyclopedia of Philosophy notes that it literally means "non-secondness". In Advaita, the true self is described as "one without a second" (Stanford Encyclopedia of Philosophy).

Non-duality is close to monism, the idea that everything is one, but writers distinguish the two. The philosopher Amod Lele points out that saying things are "not two" does not by itself say they are one: some traditions describe the ultimate as one, others as closer to "zero".

Advaita Vedanta

According to the Stanford Encyclopedia of Philosophy, the classical Indian philosophy of Advaita Vedanta "articulates a philosophical position of radical nondualism", and its most sustained early statement is in the works of Śaṅkara, who flourished in the eighth century CE (scholars' estimates of his exact dates differ). The school draws on three bodies of scripture: the Upanishads, the Bhagavad Gita and the Brahma Sutras.

Śaṅkara was, in the SEP's words, "a systematizer of Advaita Vedānta, not a founder". Tradition names his teacher as Govinda and Govinda's teacher as Gauḍapāda (sixth century CE), author of verses on the Māṇḍūkya Upaniṣad known as the Gauḍapādakārikās; the same entry notes that the historical record of the school before Gauḍapāda is obscure.

Its central claim is that the self (ātman) is pure consciousness and is identical with brahman, the single ground of everything. The same entry cites the Upanishadic "great sentence" tat tvam asi, "You are that" (Chāndogya Upaniṣad 6.8.7), as a statement of this identity. The world of many separate things is treated as an appearance that is neither wholly real nor wholly unreal; the word for this appearance is māyā, though Śaṅkara himself uses it infrequently. Śaṅkara's best-known illustration is a rope mistaken in poor light for a snake: the rope never actually turns into a snake, yet the snake seen is not something separate from the rope. In the same way, according to the SEP, brahman never really transforms into the world, and from the ultimate standpoint the world "is never truly born because nonduality is not subject to causation". The IEP describes three levels of reality: the absolute, the everyday world, and outright illusion such as a mirage.

Liberation (mokṣa), in this view, comes through self-knowledge: a direct understanding of oneself as brahman that removes the error Advaita calls superimposition (SEP).

Disagreement within Vedanta

Other Vedanta schools reject Advaita's conclusion.

• Viśiṣṭādvaita, usually translated "qualified non-dualism", is associated with Rāmānuja (traditionally c. 1017–1137, though recent scholarship places his life in 1077–1157). It holds that brahman is the Self of all, with souls and the world as its body: united with it, but really distinct. Rāmānuja argued that ignorance cannot explain individuality, because ignorance already requires an individual who is ignorant (IEP, "Rāmānuja").
• Dvaita ("dualism"), founded by Madhva (1238–1317), teaches a fivefold real difference: between God and souls, God and matter, souls and matter, one soul and another, and one material thing and another. Madhva held that perception is valid, so the plurality it shows is ultimately real, and that the Vedas cannot teach an identity that everyday experience contradicts (IEP, "Madhva").

Buddhist non-duality

Buddhist philosophy has its own ideas of non-duality, but they differ from Advaita's. Lele contrasts Śaṅkara, for whom the ultimate "is best described as one", with the Madhyamaka school, which characterizes ultimate reality as śūnyatā (emptiness).

Madhyamaka

Madhyamaka ("the middle way") goes back to Nāgārjuna, who lived some time between about 150 and 250 CE, probably mainly in southern India; his most important work is the Mūlamadhyamakakārikā (Fundamental Verses on the Middle Way), 450 stanzas long (Stanford Encyclopedia of Philosophy, "Nāgārjuna"). For Nāgārjuna, emptiness is always the emptiness of svabhāva: "inherent existence" or "intrinsic nature" (SEP). Things are empty not because nothing exists but because nothing exists independently, on its own terms.

The verses most often cited for a Buddhist non-duality are Mūlamadhyamakakārikā 25.19–20, which deny any difference between saṃsāra (the cycle of rebirth) and nirvāṇa (liberation from it). The religion scholar Garth Mason, surveying the commentators Kalupahana, Inada, Garfield, Westerhoff, and Siderits and Katsura, finds that all of them translate the verses as saying that the limit of nirvāṇa and the limit of saṃsāra are exactly the same, and that the more recent commentators qualify the identity by tying it to the claim that emptiness and dependent origination are the same thing. Mason himself argues that the relation is best read as equivalence rather than strict identity (Journal for the Study of Religion 27, no. 2, 2014).

The Vimalakīrti Sūtra

A well-known treatment of non-duality in Buddhist literature is a chapter of the Vimalakīrti Sūtra titled "The Dharma-Door of Nonduality" (the eighth chapter in the 84000 edition of Robert Thurman's translation). The layman Vimalakīrti asks the assembled bodhisattvas how each of them enters non-duality and receives thirty-one replies, each naming a pair of opposites and how it is overcome. One says, in Thurman's translation, "'Defilement' and 'purification' are two" (Tricycle, Spring 1993). The bodhisattva Mañjuśrī praises them all but says their explanations "are themselves dualistic", and proposes that the entrance lies in expressing and explaining nothing. When Mañjuśrī asks Vimalakīrti for his own view, Vimalakīrti "kept his silence, saying nothing at all", and Mañjuśrī applauds this as "the entrance into the nonduality of the bodhisattvas" (Tricycle).

The sūtra was translated into Chinese seven times between 188 and 650 CE, with Kumārajīva's version of 406 the most popular. Its Sanskrit text was thought lost until a manuscript was found in the Potala Palace in Lhasa in 1998, and edited versions were published in 2004 and 2006 (84000, introduction).

Śaṅkara's view of the Buddhists

Śaṅkara argued against Buddhist positions directly. He rejected the idealism of the Yogācāra school, holding that perception of an outside world must be assumed, and he regarded the Madhyamaka position, as he understood it, as "counter-intuitively nihilistic", because it denied that any unchanging ground of existence remains once all forms are analysed away (SEP, "Śaṅkara").

Kashmir Śaivism

A third major Indian form of non-duality developed among worshippers of Śiva in Kashmir. Its philosophical school is called Pratyabhijñā, "Recognition", according to André Padoux's article in the Encyclopedia of Religion (Padoux, 1987). Its doctrine was first set out systematically by Somānanda (probably ninth century) in the Śivadṛṣṭi, then by his disciple Utpaladeva in the Īśvarapratyabhijñākārikā (Verses on the Recognition of God), and was further developed by Abhinavagupta (tenth to eleventh century) in two important commentaries.

For this school, consciousness, identified with Śiva, is the one absolute reality, and the world is its own "shining forth" (ābhāsa) projected on itself as on a screen. Padoux stresses the difference this makes: the world is "insubstantial — though not illusory", because in its ultimate nature it is made of the same stuff as consciousness. Bondage comes from a power of Śiva that conceals this identity, and liberation is recognition: "the knowledge regained of the identity of the individual self and of the world with the Supreme Source of all" (Padoux).

Modern teachers

In the twentieth century, Ramana Maharshi (1879–1950), Nisargadatta Maharaj (1897–1981) and H. W. L. Poonja (1913–1997) became important sources for a "Modern Advaita" movement in the West. By January 2013 it counted more than two hundred teachers and organizations, many of them holding satsangs (teaching meetings), according to the historian of religions Phillip Charles Lucas (Nova Religio, 2014).

Lucas describes a split within the movement. Traditionalists hold that realization needs sustained practice (sādhanā), moral preparation, scripture and a qualified teacher. Non-traditional teachers are more eclectic, sometimes drawing on Sufism and Zen, and some say no practice is needed. Their critics sometimes call them "Neo-Advaita", a label Lucas notes is used pejoratively. His article takes no side on whose approach works.

Sources

• Neil Dalal, "Śaṅkara", Stanford Encyclopedia of Philosophy, first published 4 October 2021.
• Sangeetha Menon, "Advaita Vedanta", Internet Encyclopedia of Philosophy (undated).
• Shyam Ranganathan, "Rāmānuja", Internet Encyclopedia of Philosophy (undated).
• Valerie Stoker, "Madhva", Internet Encyclopedia of Philosophy (undated).
• Phillip Charles Lucas, "Non-Traditional Modern Advaita Gurus in the West and Their Traditional Modern Advaita Critics", Nova Religio 17, no. 3 (2014): 6–37.
• Jan Westerhoff, "Nāgārjuna", Stanford Encyclopedia of Philosophy, first published 10 February 2010, substantive revision 31 May 2026.
• Garth Mason, "Is Samsāra actually the Same as Nirvāṇa? A Critical Examination of Nāgārjuna's Provocative Understanding of Emptiness", Journal for the Study of Religion 27, no. 2 (2014): 94–114.
• Robert A. F. Thurman (trans.), The Teaching of Vimalakīrti (Toh 176), 84000: Translating the Words of the Buddha; first published as The Holy Teaching of Vimalakīrti, Pennsylvania State University Press, 1976.
• Robert A. F. Thurman (trans.), "The Dharma Door of Nonduality", Tricycle, Spring 1993.
• André Padoux, "Śaivism: Pratyabhijñā", Encyclopedia of Religion (1987), via Encyclopedia.com.
• Amod Lele, "Nondualism without monism", The Indian Philosophy Blog, 1 December 2024.