Hindu philosophy traditionally recognises six orthodox schools of thought. Four of them, Nyaya, Vaisheshika, Samkhya, and Mimamsa, built distinct systems of logic, physics, and ritual interpretation.
📚 Six Schools, Paired Into Three
Six Schools, Paired Into Three
- School PairingsThe six orthodox schools are traditionally grouped in three pairs: Nyaya-Vaisheshika, Samkhya-Yoga, and Mimamsa-Vedanta.
- WhyEach pair shares closely related concerns, one contributing the theory and the other applying it, or one handling logic while the other handles the physical world it reasons about.
- So whatThis pairing was a deliberate act of systematising Indian philosophy, not an accident of history — six schools organised into three domains rather than left as six unrelated systems.
📚 Nyaya and Vaisheshika: Logic and Physics
Nyaya: A Formal System of Logic
- Nyaya FounderThe Nyaya school, founded by Gautama, developed a formal system of logic.
- HowIt centres on structured reasoning, including a form of syllogism used to establish valid knowledge.
Vaisheshika: An Early Theory of Atoms, and Logic and Physics as Complementary Tools, and The Five-Step Argument Behind Nyaya Logic, and Vaisheshika’s Seven Boxes for All of Reality, and An Independent Echo of Greek Atomism
- Vaisheshika AtomismThe Vaisheshika school, founded by Kanada, developed an early theory of atomism.
- HowIt classified reality into distinct categories of substance.
- Nyaya-Vaisheshika LinkNyaya’s formal logic and Vaisheshika’s physical categories were later treated as complementary systems.
- TakeawayNyaya’s reasoning tools were often applied to establish the very categories Vaisheshika described.
- Panchavayava StepsNyaya’s syllogism is not a bare two-line deduction. It has five distinct steps, called the Panchavayava.
- HowThe classic example: “The mountain is fiery” (the proposition), “because it has smoke” (the reason), “whatever has smoke is fiery, like a kitchen” (a general rule plus a concrete example), “the mountain has smoke” (applying the rule to this case), and finally “therefore the mountain is fiery” (the conclusion).
- TakeawayUnlike a standard Western syllogism, Nyaya insists on a real-world example at step three. This grounds abstract reasoning in something the listener can actually picture.
- Padartha CategoriesVaisheshika’s atomism came with a companion project: sorting everything that exists into a fixed set of categories, called padarthas.
- HowSubstance, quality, action, generality, particularity, and inherence made up the original six. A seventh, non-existence, was added later by thinkers like Sridhara and Udayana, once the school grew more concerned with how we know something is absent, not just what is present.
- TakeawayAdding a category just to classify absence shows how seriously Vaisheshika took the project of accounting for literally everything, including the negative case.
- Atomism ComparisonVaisheshika’s atomism, developed independently in ancient India, is often compared to early Greek atomist thought.
- TakeawayThe two systems arose from very different philosophical starting points, showing how similar physical intuitions can emerge from separate traditions.
📚 Samkhya and Mimamsa: Consciousness, Ritual, and Metaphysics
Samkhya: Consciousness and Matter
- Samkhya DualismThe Samkhya school proposes a dualism between Purusha, consciousness, and Prakriti, matter or nature.
- HowLiberation comes through correctly distinguishing between the two.
Mimamsa: Getting Ritual Right
- Mimamsa FounderThe Mimamsa school, founded by Jaimini, focused on interpreting Vedic ritual injunctions.
- HowIt treated correct ritual performance as central to dharma.
Theory Feeding Practice: Samkhya and Yoga, and Mimamsa vs Vedanta: Ritual vs Metaphysics
- Samkhya-Yoga LinkSamkhya’s Purusha-Prakriti dualism heavily influenced the Yoga school’s own practical framework.
- TakeawayYoga is traditionally paired with Samkhya precisely because it builds practice on top of Samkhya’s theory. See ArtnCulture0047 — Patanjali’s Yoga Sutras and the Eight Limbs.
- Mimamsa FocusMimamsa’s intense focus on ritual precision made it less concerned with metaphysical speculation than schools like Vedanta.
- TakeawayIts central question was how to correctly interpret and perform Vedic injunctions, not what ultimate reality consists of.
Exam Point of View
CDS II 2022: Kumarila Bhatta and Prabhakara’s School
- PYQCDS asked which school of philosophy Kumarila Bhatta and Prabhakara belonged to. The answer is Purva-Mimamsa, the school focused on ritual and Vedic duty (as opposed to Uttara-Mimamsa/Vedanta’s focus on knowledge of Brahman).
- LinkSource: CDS II 2022 (see Q37).
Not Charvaka: A Common Exam Mix-Up
- PYQCDS II 2022 asked which of the following are Charvaka schools of philosophy: Dhurtta, Nyaya, Sushikshita, and Vaisheshika.
- AnswerDhurtta and Sushikshita only. The correct answer is (d), 1 and 3.
- WhyNyaya and Vaisheshika are two of the six orthodox schools covered in this very article, not sub-schools of the heterodox, materialist Charvaka. Dhurtta and Sushikshita are Charvaka’s own two internal divisions: Dhurtta rejected the soul entirely, while Sushikshita accepted a soul that simply perishes with the body. Confusing orthodox school names with Charvaka’s internal sub-schools is exactly the trap this question sets. See AncHist0116 — Charvaka (Lokayata) for the heterodox side of this contrast.
- LinkVerified against Prepp, Charvaka School or Lokayata Philosophy.
“Orthodox” Doesn’t Mean Believing in God
- Astika-Nastika DistinctionThe Sanskrit terms astika (orthodox) and nastika (heterodox) are often mistranslated as “theist” and “atheist.” The real dividing line is acceptance of Vedic authority, not belief in God.
- WhySamkhya, and the early Mimamsa school, do not require belief in a creator God, yet both remain astika because they accept the Vedas as authoritative. This is a genuinely counter-intuitive exam point: a school can be officially “orthodox” while staying silent on, or even rejecting, a personal God.
- LinkVerified against Britannica, Astika.
Current Affairs / So What
The Government Now Funds Research Into These Very Schools
- DevelopmentThe Ministry of Education runs a dedicated Indian Knowledge Systems Division under AICTE, which lists Nyaya, Vaisheshika, Samkhya, and Mimamsa among its core research areas.
- FundingIn early 2025 the division opened its 2025-26 round of IKS Postdoctoral Fellowships, worth up to ₹1,00,000 a month, alongside dedicated IKS Research Centre grants.
- CurriculumUGC has separately mandated that every undergraduate programme carry Indian Knowledge Systems credits worth at least 5% of total coursework, so these six schools are no longer just exam trivia but active university curriculum.
- SourceAICTE, Indian Knowledge Systems Division.
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