Vedanta (Advaita)

The Upanishads (c. 800–200 BCE). The seed texts. In dialogues like that of the sage Uddalaka Aruni and his son Shvetaketu in the Chandogya Upanishad, the teaching of Brahman-Atman identity is stated directly.

The famous formula “Tat Tvam Asi” (“That Thou Art”) appears in Chandogya Upanishad 6.8.7, repeated as the refrain closing nine successive teachings — verified placement, not the often-misquoted location.

• Gaudapada (c. 7th c. CE). His Mandukya Karika is the earliest systematic Advaita text. Notably, Gaudapada adapted analytical concepts from Buddhist (especially Mahayana / Yogachara) philosophy and gave them a Vedantic basis — which is why his author node sits in the buddhist mind only group: the cross-pollination is real, not incidental.
• Adi Shankara (c. 788–820 CE). The great systematizer. He did not invent Advaita but synthesized and rejuvenated it, writing commentaries (bhashyas) on the Upanishads, the Brahma Sutras, and the Bhagavad Gita, and giving a firmly Vedantic character to the Buddhistic elements that had entered through Gaudapada. Mainstream scholarship places him in the 8th c.; “788–820” is the standard traditional dating, held loosely.
• Modern revival (19th–20th c.). Swami Vivekananda (1863–1902) carried a “Neo-Vedanta” — secularized, practical, universalist — to the West (notably the 1893 Parliament of Religions). Sri Aurobindo reworked Vedanta into an evolutionary, world-affirming vision. Ramana Maharshi (1879–1950) revived direct self-enquiry; Nisargadatta Maharaj (1897–1981) taught abiding in the sense “I Am.” These figures are the bridge from the ancient texts to the contemporary nondual scene.

A note on the evidence — Advaita is not all of Vedanta. It is easy to say “Vedanta teaches that all is one,” but the Vedanta schools genuinely disagree. Advaita (Shankara): pure non-dualism — Atman is Brahman, full stop. Vishishtadvaita (Ramanuja, 11th–12th c.): qualified non-dualism — souls and world are real parts of a personal God (Brahman as Ishvara with attributes), not collapsible into bare identity. Dvaita (Madhva, 13th c.): outright dualism — the soul and God are eternally distinct. They are not three flavors of one mush; they are rival readings of the same Upanishads. This page treats the Advaita line, and says so.

> A note on the evidence — “maya” does not simply mean “the world is an illusion.” Popular accounts flatten maya into “it’s all fake.” Shankara’s actual position is subtler: the world is mithya — neither absolutely real nor absolutely unreal, but possessing a dependent, borrowed reality that rests entirely on Brahman (the doctrine of vivarta, apparent manifestation). At the everyday (vyavaharika) level the world fully functions; it is only “less real” relative to the one unconditioned reality (paramarthika). The accurate rendering is the world’s dependent, non-ultimate, appearance-status — not “nothing is there.”

Brahman — the one reality. A single, unconditioned, attributeless ground (nirguna Brahman) underlies all appearance; it is being-consciousness-bliss (sat-chit-ananda). (→ All Is One, Consciousness Is Fundamental.)

• Atman = Brahman. The innermost Self is not a part of Brahman or like Brahman — it is Brahman. The four mahavakyas (“great sayings”) state this, above all Tat Tvam Asi (“That Thou Art”) and Aham Brahmasmi (“I am Brahman”). (→ All Is One, All Is One.)
• Maya. The power by which the one appears as the many; the dependent, non-ultimate status of the phenomenal world (see the note on the evidence). (→ All Is One.)
• Neti neti — “not this, not this.” The method of negation: peeling away every object, role, and identification (“I am not the body, not the mind…”) until only the unobjectifiable witness remains. (→ All Is One, All Is One.)
• Jnana yoga. The path of liberating knowledge (as distinct from devotion or works) — moksha comes through seeing, not earning. (→ All Is One.)
• Self-enquiry (“Who am I?”). Ramana Maharshi’s distilled practice: trace the “I”-thought back to its source until the separate “I” reveals its own unreality. (→ All Is One, All Is One.)

Adi Shankara (c. 788–820 CE) — the systematizer of Advaita; commentaries on the Upanishads, Brahma Sutras, Gita.

• Gaudapada (7th c. CE) — Mandukya Karika, earliest systematic Advaita; the Buddhist-Vedanta bridge.
• Swami Vivekananda (1863–1902) — Neo-Vedanta; brought Advaita to the West.
• Sri Aurobindo (1872–1950) — evolutionary, world-affirming Vedanta.
• Ramana Maharshi (1879–1950) — self-enquiry, “Who am I?”; Be As You Are.
• Nisargadatta Maharaj (1897–1981) — “I Am That”; abiding in the “I Am.”
• Primary texts: the Upanishads (esp. Chandogya, Mandukya), the Brahma Sutras, the Bhagavad Gita — the “triple canon” (prasthanatrayi).
• Rival-school founders (in prose; no nodes): Ramanuja (Vishishtadvaita), Madhva (Dvaita).

Vedanta states several Atlas truths at their source. All Is One all is one — Brahman, the one without a second. All Is One the seeker is what they seek — Tat Tvam Asi, the goal is your own nature.

All Is One the deeper Self — Atman beneath the ego, reached by neti neti. Consciousness Is Fundamental consciousness is fundamental — Brahman as chit, awareness as the ground of being.

All Is One inner gnosis liberates — jnana, liberating knowledge that dissolves bondage by correcting an error of seeing. A reader can drop from any of these back into this root.

Grew from / alongside: the Vedas and Upanishads, and in close (sometimes contentious) dialogue with Buddhism — Gaudapada’s Advaita absorbed Mahayana analysis, and critics have long noted the family resemblance.

It also shares ground with the yogic and tantric streams (Kashmir Shaivism, the practices of self-realization)., Seeded: the entire modern nonduality movement (Ramana → Nisargadatta → the contemporary satsang teachers), Western “Neo-Vedanta,” and — through Vivekananda, Vedanta Societies, and later popularizers — much of the vocabulary (“the One,” “the Self,” “you are already That”) that flows into New Thought and modern manifestation culture.