Sankhya (सांख्य) is one of the six classical darshanas (orthodox philosophical schools) of Sanatan thought. Its name means "enumeration", and it offers a careful enumeration of the basic realities (tattvas) that constitute experience. Its central thesis is dualist: there are two ultimate principles, pure consciousness (purusha) and unconscious nature (prakriti), whose interaction generates the entire phenomenal world.
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Purusha is described as pure, witnessing consciousness — uncreated, eternal, plural (each living being has its own ), inactive, and free. Prakriti is the unmanifest material principle — uncreated, eternal, single, dynamic, and unconscious. The world arises when purusha's mere presence stirs into evolution; it ceases for an individual when purusha's distinction from is realised.
The Three Gunas
is constituted of three gunas — qualities or strands. Sattva is the light, clear, and harmonious; rajas is the active and passionate; tamas is the heavy, dark, and inertial. In unmanifest the three are in perfect equilibrium. When that equilibrium is disturbed, evolution begins, and every manifest entity is a particular blend of the three.
The Twenty-Five Tattvas
The Sankhya Karika of Ishvarakrishna systematises twenty-five tattvas: and , then the evolutes — mahat (cosmic intelligence) or buddhi, ahamkara (ego-sense), manas (mind), the five jnanendriyas (sense organs), the five karmendriyas (action organs), the five tanmatras (subtle elements), and the five mahabhutas (gross elements). This enumeration aims to map experience all the way from pure awareness down to physical body and world.
Bondage and Liberation
For Sankhya, bondage is not a defect of but a case of mistaken identity. The , eternally free, appears bound only because it identifies with the activities of — sensations, thoughts, ego. Liberation (kaivalya, "aloneness") is the recognition of as utterly distinct from , after which continues but no longer entangles consciousness.
Atheist or Theist?
Classical Sankhya as presented in the Karika does not explicitly posit a creator God; it accounts for evolution by the inherent dynamism of in the presence of . Patanjali's Yoga, often paired with Sankhya, adds Ishvara as a special . Later Sankhya commentators and many Vedantic readers integrated theistic elements; the Bhagavad Gita's second chapter draws on Sankhya analysis within an explicitly theistic framework.
Relation to Yoga
Sankhya and Yoga are often paired (sankhya-yoga) as theory and practice. Sankhya analyses; Yoga prescribes the disciplines by which the analysis is realised in experience. Patanjali's Yoga Sutras presuppose a largely Sankhyan ontology while adding the practical eight limbs and Ishvara-pranidhana.
Influence
Sankhya's vocabulary — , , the three gunas, the evolutes — pervades classical Sanatan thought far beyond the formal Sankhya school. It shapes the Bhagavad Gita, the Puranas, Ayurveda, classical aesthetics, and the practical psychology of yoga. Even Vedantic schools that reject its dualism use its categories to describe phenomenal life.
A School of Discrimination
Sankhya's enduring gift is the discipline of viveka — careful discrimination between consciousness and what is presented to consciousness. To learn to ask "what is the seer and what is the seen?" and to live with that question is, in Sanatan terms, to begin walking the road that ends in freedom.