--- title: "Key Concepts — Advaita Vedanta & Upanishads — Advaita & Upanishads Codex" slug: "concepts" type: "concept-hub" category: "advaita-concepts" url: "https://thecodex.expert/advaita/concepts/" url_json: "https://thecodex.expert/advaita/api/v1/entries/concepts" source_citation: "" confidence: "high" author: "LUDIFU" last_updated: "2026-04-27" word_count: 4826 cite_as: "Key Concepts — Advaita Vedanta & Upanishads — Advaita & Upanishads Codex, Advaita & Upanishads Codex, https://thecodex.expert/advaita/concepts/, last updated 2026-04-27." --- # Key Concepts **Source:** Advaita & Upanishads Codex **URL:** https://thecodex.expert/advaita/concepts/ **Type:** concept-hub **Category:** advaita-concepts **Confidence:** High — sourced from Tier 1/2 academic translations **Last updated:** 2026-04-27 ## Summary Key concepts of Advaita Vedanta and the Upanishads: Brahman, Ātman, Māyā, Mokṣa, Turīya, Mahāvākyas, Neti Neti, Sākṣī, Viveka-Vairāgya, Pañcakośa,… ## Content ## The Complete Advaita Philosophical System ## The Central Claim and Its Philosophical Structure ## The Central Concepts and Their Relationships ## The Three Levels of Reality ## The Mahāvākyas: The Great Sayings ## Liberation: What It Is and What It Is Not ## The Concepts Pages: How to Use Them ## The Key Concepts at a Glance ## Why the Non-Dual Claim Is Philosophically Radical ## The Four Aims and Their Resolution ## The Advaita Response to Suffering ## Advaita and Other Indian Philosophical Schools Key Concepts — Advaita Vedanta & Upanishads — Advaita & Upanishads Codex Home › Concepts Key Concepts The central ideas of Advaita Vedanta and the Upanishads — each explained at three levels, with primary sources and Sanskrit text throughout. The Central Claim Core · Start here आत्मा ब्रह्म Ātman is Brahman — The Identity Claim The individual self and the ground of all existence are not two different things. The central claim on which the entire Advaita tradition stands — what it means, why it is made, and what the four Mahāvākyas point toward. The Ground and the Self ब्रह्म Brahman — the ground of all existence Not a god standing apart from creation. The very being-consciousness-fullness that is the nature of all that exists. Sat-Cit-Ānanda. आत्मन् Ātman — the self Not the ego or personality. The pure witnessing awareness present through all states of consciousness, unchanged by any of them. सत्-चित्-आनन्द Sat-Cit-Ānanda Being, consciousness, bliss — the three intrinsic indicators of Brahman's nature. Not attributes added to Brahman but what Brahman is. साक्षिन् Sākṣī — the witness The pure awareness that witnesses all states without being any of them — the Advaita term for Ātman in its function as unchanging ground of all experience. The Veil and Liberation माया Māyā The power by which Brahman appears as many. Not illusion — the world exists. But the ground of the world's appearance is Brahman, not the world itself. मोक्ष Mokṣa — liberation Not a destination after death. The recognition that the self was never bound. Bondage was a misidentification — liberation is seeing through it. तुरीय Turīya The fourth — not a fourth state but the witnessing awareness present through waking, dream, and deep sleep without being any of them. पञ्चकोश Pañcakośa — the five sheaths The Taittirīya Upaniṣad's model of the five layers within which Ātman appears to be enclosed — and the practice of distinguishing Ātman from each. The Cycle and Its Ground संसार Saṃsāra — the cycle The cycle of birth, death, and rebirth driven by karma from avidyā. Not a location — a condition that Advaita's inquiry dissolves. कर्म Karma — action and consequence The three types: accumulated, in-motion, being-made. Why karma prepares the mind for liberation but cannot itself produce it. अध्यास Adhyāsa — superimposition Śaṅkara's foundational concept: the mutual superimposition of self and not-self. The root cause of bondage — and what the inquiry dissolves. जीवन्मुक्त Jīvanmukta — liberated while living Liberation in Advaita is not death. The burnt rope holds its shape but cannot bind. What changes and what does not after recognition. ईश्वर Īśvara — the personal God Brahman through the lens of māyā — creator, sustainer, dissolver. How the personal God relates to attributeless Brahman. Why Advaita is not atheism. प्राण Prāṇa — vital breath The animating principle of all life. The second of the five sheaths — subtler than the physical body, grosser than the mind. गुण The Three Guṇas Sattva, rajas, tamas — the three qualities of all manifest existence including the mind. Why the Advaita inquiry cultivates sattva without identifying with it. Gauḍapāda's Advaita अजातिवाद Ajātivāda — non-origination Gauḍapāda's doctrine that nothing has ever been born or has ever ceased. The most radical position in Advaita philosophy — and the one that most directly faces the question of where the world comes from. गौडपाद Gauḍapāda and the Māṇḍūkya Kārikā The first systematic Advaita philosopher. His Kārikā — four chapters of verse commentary on the Māṇḍūkya Upaniṣad — is the bridge between the Upanishads and Śaṅkara's architecture. Method and Practice महावाक्य The Four Mahāvākyas The four great sentences of the Upanishads — each a direct pointing statement of Brahman-Ātman identity, from a different Upanishad and a different angle. नेति नेति Neti Neti — Not This, Not This The method of negation. Every description of Brahman is negated — not to arrive at nihilism, but to exhaust the mind's habit of treating Brahman as an object. विवेक वैराग्य Viveka and Vairāgya Discrimination and dispassion — the two foundational orientations the Advaita tradition says are needed before the inquiry into Brahman can succeed. ॐ Oṃ — the syllable All this is Oṃ — so begins the Māṇḍūkya Upaniṣad. The four elements of Oṃ (A, U, M, and the silence after) map onto the four states of consciousness. The Complete Advaita Philosophical System The Advaita Vedanta system is one of the most comprehensive and internally consistent philosophical frameworks in the world's intellectual history. It offers a complete account of ontology (what ultimately is), epistemology (how the ultimately real can be known), cosmology (how the many appears from the one), ethics (how the recognition of non-duality transforms conduct), soteriology (what liberation consists in and how it is attained), and axiology (what constitutes the highest value and the highest aim of human life). These six dimensions are not separate philosophical doctrines bolted together; they are all expressions of the same non-dual recognition — that Brahman is the one awareness that is the ground of all things — developed with rigorous consistency across each domain. Understanding any one dimension fully requires understanding all the others, which is why the Advaita curriculum is a curriculum rather than a list of independent topics: the soteriology (mokṣa as recognition of ātman-Brahman identity) only makes sense in the context of the ontology (Brahman is the only ultimately real) and the epistemology (the recognition is not produced by knowledge-as-information but by knowledge-as-direct-investigation). The Concepts section of this Codex covers the central ideas of this system at three levels: the core claim, its philosophical elaboration, and its practical application. The Central Claim and Its Philosophical Structure The Advaita tradition's central claim — ātman is Brahman, the individual self and the ground of all realit --- *Cite as: "Key Concepts — Advaita Vedanta & Upanishads — Advaita & Upanishads Codex", Advaita & Upanishads Codex, https://thecodex.expert/advaita/concepts/, last updated 2026-04-27.* *Part of [Advaita & Upanishads Codex](https://thecodex.expert/advaita) — a LUDIFU knowledge project.*