Topic 15: Indian Philosophy

1. Overview: Astika & Nastika

Indian philosophy divides into astika ("it exists" — those accepting the authority of the Vedas) and nastika ("it does not" — those rejecting it). This single distinction, based on Vedic authority rather than theism, is the backbone of the topic.

• Six astika schools accept Vedic authority and are traditionally studied in three pairs: Nyaya–Vaisheshika (logic + atomism), Samkhya–Yoga (dualism + practice), Mimamsa–Vedanta (ritual + knowledge).
• Three nastika schools reject the Vedas: Charvaka (materialist), Buddhism and Jainism.
• Shared goal: most schools seek liberation (moksha/nirvana/kaivalya/apavarga) from the cycle of rebirth — philosophy is soteriological, not merely academic.

2. Nyaya, Vaisheshika & Samkhya

The first cluster covers the logical, atomistic and dualist systems — the analytical backbone of Indian thought, dealing with valid knowledge, the physical world and the fundamental duality of matter and spirit.

• Nyaya is the school of logic — it developed the theory of valid knowledge (pramana), holding that liberation comes through correct reasoning; it accepts four pramanas: perception, inference, comparison and testimony.
• Vaisheshika is the oldest atomistic system — Kanada held that all matter is made of eternal atoms (paramanu); it complements Nyaya's logic with physics/metaphysics.
• Samkhya is the oldest school — a dualism of eternal Purusha (pure consciousness, plural) and Prakriti (primal matter with three gunas: sattva, rajas, tamas); liberation is discriminative knowledge separating the two. It is famously non-theistic.

3. Yoga, Mimamsa & Vedanta

The second cluster covers the practical, ritualist and knowledge-oriented systems — how to discipline the mind (Yoga), how to interpret Vedic ritual (Mimamsa), and how to know ultimate reality (Vedanta).

• Yoga (Patanjali's Yoga Sutra) shares Samkhya's metaphysics but adds a personal God (Ishvara) and, above all, a practical eight-limbed method (yama, niyama, asana, pranayama, pratyahara, dharana, dhyana, samadhi) to still the mind.
• Mimamsa (Purva Mimamsa, Jaimini) is the philosophy of Vedic ritual — it treats the Veda as eternal and authoritative and focuses on dharma through correct action.
• Vedanta (Uttara Mimamsa, Badarayana's Brahma Sutra) is the "end of the Vedas" — the inquiry into Brahman and the self, the most influential school, branching into several sub-schools.

4. The Vedanta Sub-schools

Vedanta became the dominant strand of Indian philosophy and split into rival interpretations of the relation between the individual soul (Atman/Jiva), the world and the Absolute (Brahman) — the great medieval theological debate.

• Advaita (Shankara) holds Brahman is the only reality and the perceived world is maya (appearance); liberation is realising Atman = Brahman — the summit of monism.
• Vishishtadvaita (Ramanuja) affirms a personal God (Vishnu) whose "body" is the real world and souls; it grounds Bhakti with philosophical rigour.
• Dvaita (Madhva) insists on an eternal difference between God, souls and matter — a robust theism supporting devotional worship.

5. Nastika (Heterodox) Schools

The nastika schools reject Vedic authority. Charvaka is the radical materialist outlier, while Buddhism and Jainism developed sophisticated philosophies alongside their religious teaching.

• Charvaka (Lokayata) is India's materialist-hedonist school — it accepts only perception (pratyaksha) as valid knowledge, denies soul, God, karma and rebirth, and is preserved mainly through its critics.
• Buddhist philosophy teaches anatta (no permanent self), anicca (impermanence) and pratityasamutpada (dependent origination), later branching into schools like Madhyamaka (Nagarjuna) and Yogachara.
• Jain philosophy is realist and pluralist — Anekantavada (reality is many-sided) and Syadvada (conditioned assertion) counsel intellectual humility.

6. Master Comparison Table

The whole topic collapses into one nine-row grid. Memorise founder, text and the one-line core idea — this is the highest-yield table in the file.

7. Key Concepts & Epistemology

Beyond the schools, UPSC tests shared conceptual vocabulary — the means of knowledge (pramana), the goals of life (purushartha) and core metaphysical terms that recur across systems.

• Pramanas: schools differ on how many they accept — Charvaka only perception (1), Vaisheshika/Buddhism two, Samkhya three, Nyaya four, Mimamsa/Vedanta six.
• Purushartha: the four legitimate human goals balance worldly life (artha, kama) within moral order (dharma) toward liberation (moksha).
• Different liberations, one aim: the words differ (moksha, kaivalya, nirvana, apavarga) but each names freedom from the bondage of rebirth.

8. Modern Indian Philosophy

Nineteenth- and twentieth-century thinkers reinterpreted classical philosophy for the modern age — reconciling Vedanta with reason, social reform and nationalism.

• Vivekananda turned Advaita into "practical Vedanta" — service of the poor (daridra narayana) as worship — and carried it to the West at the 1893 Parliament of Religions.
• Aurobindo reworked Yoga into a philosophy of spiritual evolution; Gandhi built a political ethics of truth and non-violence from classical roots.
• Ambedkar's Navayana reinterpreted Buddhism as a rational, this-worldly ethic of equality, guiding his 1956 mass conversion.

9. Relevance & Current Affairs

Classical Indian philosophy is not a museum piece — Yoga, Vedanta and Buddhist thought inform global well-being, ethics and India's cultural diplomacy, giving the topic a current-affairs edge.

• International Day of Yoga (21 June): declared by the UN in 2014 (India-led resolution) — Patanjali's Yoga philosophy as global soft power and public-health tool.
• Mindfulness & well-being: Buddhist meditation (vipassana) and yogic practice underpin worldwide mental-health and stress-management movements.
• Ethics & governance: concepts like nishkama karma, dharma and trusteeship (Gandhi) feature in GS-IV ethics and public-service values.
• Neo-Vedanta & identity: Vivekananda's ideas remain influential in debates on Indian identity, service and national purpose.
• Preservation & scholarship: Sanskrit-philosophy scholarship gains from the Classical-language framework and institutes like the Indian Council of Philosophical Research (ICPR).

10. Prelims PYQs

Philosophy is tested as school–founder–idea matching. Practice MCQs below mirror the UPSC pattern; blocks without a genuine dated PYQ are honestly labelled "concept practice".

11. Mains PYQs + Model Answers

Model GS-I / GS-IV questions on Indian philosophy. Each carries a full skeleton — Introduction → body → Conclusion.