Advaita Vedanta is the non-dualist school of Vedanta philosophy, systematised by Adi Shankara in the 8th century CE. The Sanskrit name a-dvaita means “not-two”: atman and Brahman are not two different realities, but one. The school takes the Brahma Sutras of Badarayana, the principal Upanishads, and the Bhagavad Gita (together called the prasthāna-traya, the threefold canon) as its scriptural ground. Shankara’s commentaries on these three are the foundational textual layer of the school.
The principal scriptural sources
- Brahma Sutras (Badarayana, c. 200 BCE–200 CE): 555 sutras in four adhyayas and 16 padas, systematising the Upanishadic teaching. Shankara’s Brahma Sutra Bhashya is the foundational Advaita commentary.
- The principal Upanishads: ten to twelve depending on the listing, including Isha, Kena, Katha, Prashna, Mundaka, Mandukya, Aitareya, Taittiriya, Chandogya, Brihadaranyaka. Shankara wrote commentaries on all of these.
- Bhagavad Gita: 700 verses in 18 chapters, embedded in the Mahabharata. Shankara’s Gita Bhashya was the first major commentary on the text.
- Mandukya Karika by Gaudapada (c. 6th century, Shankara’s parama-guru): 215 verses on the Mandukya Upanishad, often considered the earliest systematic Advaita work.
The core thesis
Shankara’s argument can be stated in three steps. First, Brahman alone is real; the empirical world has a borrowed reality. Second, the individual self (atman) is not other than Brahman; the appearance of separation is due to avidya (ignorance) functioning as superimposition (adhyāsa). Third, liberation (moksha) is the dissolution of avidya through knowledge of the non-difference, not the achievement of a new state. The famous summary by Shankara: brahma satyam jagan mithyā jīvo brahmaiva nāparaḥ, “Brahman is real, the world is appearance, the individual self is Brahman and nothing else”.
Two levels of reality
Advaita does not deny the world. It distinguishes two levels:
- Paramarthika satya: absolute reality. Brahman alone. The level from which the Mahavakyas speak.
- Vyavaharika satya: conventional reality. The empirical world of subjects and objects, where karma operates and where dharma applies. Real for all practical purposes, until the absolute is realised.
- Pratibhasika satya: apparent reality. The dream, the mirage, the rope-mistaken-for-snake. Real to the perceiver until correction.
The three-level scheme lets the Advaitin both deny the ultimate independence of the world and affirm everyday transactional reality. A house is real for the householder; karma binds the actor; the texts are authoritative for the seeker. None of this is contradicted by the absolute reality being non-dual.
The mechanism of avidya
Avidya is the technical term for the cognitive condition that makes the non-dual appear as dual. It has two functions: āvaraṇa (concealment, hiding the truth of identity) and vikṣepa (projection, throwing up the appearance of multiplicity). Shankara introduces his Brahma Sutra Bhashya with the discussion of adhyasa, the superimposition by which what is not-self appears as self and the self appears as what it is not. Liberation is the removal of avidya by knowledge, exactly as removing the cloud removes the impression of darkness over the sun.
The practice: shravana, manana, nididhyasana
Advaita prescribes a threefold discipline drawn from the Brihadaranyaka Upanishad 2.4.5:
- Shravana: hearing the Vedantic texts from a qualified teacher.
- Manana: reasoning about what has been heard, removing doubts.
- Nididhyasana: sustained meditation on the conclusion, until it becomes a direct recognition.
The fourfold qualifications (sādhana-catuṣṭaya) for taking up this discipline are: discrimination between the eternal and the non-eternal (viveka); dispassion (vairāgya); the six inner accomplishments including calm and self-control (śama-damādi-ṣaṭka-sampatti); and the burning desire for liberation (mumukṣutva).
Shankara’s institutional legacy
Shankara established four monastic seats (mathas) at the cardinal directions of India: Sringeri in Karnataka (south), Dwarka in Gujarat (west), Puri in Odisha (east), and Joshimath in Uttarakhand (north). Each is headed by a Shankaracharya, a title that continues to the present day. Tradition assigns one of the four Vedas to each matha. The mathas are the principal living institutions of Advaita Vedanta.
For what it’s worth, Advaita’s dominance in modern Hindu thought owes a lot to 19th-century neo-Vedanta figures like Swami Vivekananda, who presented Advaita as the apex of Indian philosophy in their Western lectures. The pre-modern landscape was more pluralistic, with Dvaita, Vishishtadvaita and various Shaiva and Shakta schools holding equal ground in their regional centres.
Common questions
Does Advaita say the world is unreal?
Not unreal in the sense of “doesn’t exist”. The standard term is mithyā, which means “having a dependent or apparent reality, not absolutely real”. The world is real for all practical purposes at the vyavaharika level; it is not real at the paramarthika level because it has no independent existence apart from Brahman. The popular slogan “the world is an illusion” is a poor translation of mithya.
Is Advaita atheistic?
No. Advaita is theistic at the vyavaharika level: Ishvara (Saguna Brahman, Brahman with attributes) is real, is worshipped, and is the cause of the universe. At the paramarthika level, both Ishvara and the worshipper are recognised as not other than nirguna Brahman. Advaita does not deny God; it specifies that the worshipper and the worshipped are ultimately the same reality.
Why is bhakti accepted in Advaita?
Because at the vyavaharika level the worshipper-worshipped relation is the operative framework for spiritual practice, and bhakti to Ishvara is one of the most effective means of mental purification (citta-śuddhi) that prepares the seeker for jnana. Shankara himself composed numerous hymns (stotras) to various deities; the practice is internal to Advaita rather than a concession to popular religion.
One limitation worth noting
This article presents Advaita as Shankara left it, with the standard post-Shankara consolidation. The internal Advaita tradition has sub-schools (Bhamati and Vivarana being the two main ones) that disagree on technical points such as the locus of avidya, the nature of the jiva, and whether the perceiving self is one or many. Modern Advaita teachers from Ramana Maharshi to Nisargadatta Maharaj also reshape the presentation in significant ways. A scholarly treatment would distinguish all these.
The institutional and doctrinal history is summarised at the Advaita Vedanta entry on Wikipedia. The Brahma Sutras structure used by Shankara is at the Brahma Sutras entry on Wikipedia.
