Two things exist that cannot be reduced to each other: an unconscious nature that does everything, and a conscious witness that does nothing. Everything else — matter, mind, intellect, the sense of being someone — is nature evolving, and the whole of it is happening in front of a spectator who has never been involved and does not know it.
The oldest systematic philosophy in India, and the one whose vocabulary is most widely borrowed. It is also, on principle, atheistic.
The name
saṅkhyāसङ्ख्या means both “number” and “discernment”. Both senses apply: the system enumerates twenty-five principles, and liberation consists in discriminating two of them
Root text
Sāṅkhya-kārikāसाङ्ख्यकारिका of Īśvarakṛṣṇa, c. 350–450 CE — 72 verses. The older sūtra literature is lost
Dating anchor
Paramārtha translated the Kārikā with a commentary into Chinese in the mid-sixth century, which fixes an upper bound independent of the Indian tradition
Commentaries
Yuktidīpikā (the richest, and anonymous) · Gauḍapāda's Bhāṣya · Vācaspati Miśra's Tattva-kaumudī · Māṭhara-vṛtti · Jayamaṅgalā
Later revival
Sāṅkhya-sūtra, c. 14th century, attributed to Kapila, with Vijñānabhikṣu's Sāṅkhya-pravacana-bhāṣya
Means of knowledge
Three: perception, inference, reliable testimony
Goal
kaivalyaकैवल्य — aloneness: the witness left standing apart, with nothing happening to it
God
None. The absence is argued for, not merely left out — §12
1Three kinds of sufferingदुःखत्रयम्
The Kārikā opens not with a metaphysical claim but with a complaint, and then with an argument about why the obvious remedies will not do.
Sāṅkhya is āstika because it accepts the Veda as a means of knowledge, not because it approves of what the Veda prescribes. Its opening move is to rule ritual out as a solution to the problem it cares about — which is exactly the move Vedānta will later make against Mīmāṃsā.
2The effect is already thereसत्कार्यवादः
Everything downstream depends on this. If the effect pre-exists in the cause, then the whole world can be a transformation of one thing — and Sāṅkhya can get away with only two principles instead of Vaiśeṣika's seven categories.
Sāṅkhya-kārikā 9. The fourth is the strongest and the fifth is the most consequential: if an effect is nothing but its cause in another arrangement, then tracing effects back far enough must arrive at a single stuff — which is §3.
What it costs
If nothing new ever comes into being, nothing is ever destroyed either — destruction is only a return to the unmanifest. So the world has always existed in prakṛti and always will. There is no creation, no first moment and nothing to explain by an agent. Sāṅkhya's atheism (§12) is not an add-on; it falls out of verse 9.
3Proving prakṛtiप्रकृतिसिद्धिः
Nature itself is unmanifest and never perceived. It is established by five inferences, and they run backwards from features of the world we do see.
Sāṅkhya-kārikā 15. Note the method: prakṛti is not posited as an explanation and then defended — it is derived, five separate times, from features of the observed world plus the causal doctrine of §2.
4The three strandsत्रिगुणम्
Guṇa here does not mean “quality” as it does in Vaiśeṣika. It means a strand or a rope — three constituents twisted together, of which everything material is made, and whose changing proportions account for every difference between things.
The scheme is borrowed by almost everyone: the Gītā organises three chapters around it, Āyurveda uses it for temperament (chapter 13), and Purāṇic cosmology assumes it throughout. It is Sāṅkhya's most successful export.
5The twenty-five principlesपञ्चविंशतितत्त्वानि
The evolution runs in one direction, from subtle to gross, and the order is not decorative — each stage is argued for from what the next one needs.
Twenty-five in total: prakṛti, its twenty-three evolutes, and puruṣa. Reading the diagram from the top down gives cosmology; reading it from the bottom up gives the practice, since release is the reverse journey.
6What produces whatचतुर्विधतत्त्वम्
Kārikā 3 sorts the twenty-five by their productive role, and the sort is exhaustive.
1 + 7 + 16 + 1 = 25. That the classification comes out exactly even is Sāṅkhya's way of claiming the list is complete — the same move Vaiśeṣika makes with its six contacts.
7Proving puruṣaपुरुषसिद्धिः
Everything so far is unconscious. Sāṅkhya now has to show that something else exists, and it offers five arguments.
Sāṅkhya-kārikā 17. Every one of the five is an argument from insufficiency: the material order, however elaborated, does not add up to a knower — so a knower must be supplied from outside it. Whether that inference is legitimate is the question the whole subsequent tradition asks.
The reflection, and where consciousness seems to be
If puruṣa does nothing and buddhi is unconscious, why does it seem that I think? Sāṅkhya's answer is a metaphor made technical: the intellect, being predominantly sattva, is transparent like a still pool, and the witness is reflected in it. The reflection is not the witness, and the pool is not conscious — but the compound behaves exactly as if a single conscious thinker were present.
Everything you take yourself to be is on the intellect's side of this arrangement. Liberation is not the witness getting free of something holding it, since nothing ever held it. It is the intellect finally seeing that the two are two.
8Why there are manyपुरुषबहुत्वम्
Advaita will say there is one consciousness. Sāṅkhya says many, and gives three reasons — all of them empirical.
Separate allotments
Birth, death and sense-organs are distributed individually. If there were one puruṣa, everyone would be born and die together, and one person's blindness would be everyone's.
Non-simultaneous action
People act at different times and at cross purposes. One consciousness could not be doing this and its opposite at once.
Different mixtures
The three strands are differently proportioned in different people — some calm, some driven, some dull. A single witness would not present this variety.
The Advaitin objects
Every one of your three reasons describes a difference in prakṛti — in bodies, in activity, in the proportion of the strands. None of them touches the witness, which on your own account has no qualities and does nothing. Where there are no properties there can be no differences, so there can be no plurality. You have inferred many witnesses from many mirrors.
Sāṅkhya replies
Then explain why one person's liberation is not everyone's. If the witness is one, the first release ends the world. It plainly did not.
And is answered
Because bondage was never in the witness either. On our account the whole question — whose liberation? — arises only from within the appearance, and dissolves with it.
9The lame man and the blind manपङ्ग्वन्धन्यायः
If puruṣa does nothing and prakṛti is unconscious, how does anything happen? Sāṅkhya's answer is the most famous image in the system.
Sāṅkhya offers a second image for the same relation: iron filings move near a magnet, though the magnet does nothing. Mere proximity to consciousness is enough to set unconscious nature in motion.
10Nobody is boundकैवल्यम्
तस्मान्न बध्यतेऽद्धा न मुच्यते नापि संसरति कश्चित् । संसरति बध्यते मुच्यते च नानाश्रया प्रकृतिः ॥
tasmān na badhyate 'ddhā na mucyate nāpi saṃsarati kaścit | saṃsarati badhyate mucyate ca nānāśrayā prakṛtiḥ ||
Sāṅkhya-kārikā 62 — “Therefore nothing whatever is bound, nothing is released, nothing transmigrates. It is nature, in her various supports, that transmigrates, is bound, and is released.”
11Fifty ways to be stuckप्रत्ययसर्गः
Between the metaphysics and the release, the Kārikā inserts a psychology: fifty states of the intellect, exhaustively classified. It is an unusual thing to find in a metaphysical treatise, and it reads like a field guide to failure.
The pratyaya-sarga, the intellectual creation — Sāṅkhya-kārikā 46–51
Class
Count
What it covers
Viparyaya — misconception
5
Darkness, delusion, great delusion, gloom and blind gloom. Subdivided further into 62 varieties, and identified by the commentators with the five afflictions of Yoga.
Aśakti — incapacity
28
Eleven defects of the organs — deafness, blindness and so on — plus seventeen failures of the intellect itself, being the negations of the nine contentments and the eight attainments.
Tuṣṭi — contentment
9
Nine ways of being satisfied short of the goal: four internal (resting in nature, in the means, in time, in luck) and five external (giving up on acquisition, preservation, waste, enjoyment and injury). Complacency, taxonomised.
Siddhi — attainment
8
Reasoning, oral instruction, study, the three suppressions of suffering, and friendship. The only class that gets you anywhere.
The nine contentments repay a second look. They are not vices. They are perfectly reasonable states — “nature will take care of it”, “I have the method, that is enough”, “the time is not right”, “I have given up wanting things” — and Sāṅkhya's point is that each is a comfortable place to stop, and that stopping is the failure. Eight things work; five delude you; twenty-eight incapacitate you; and nine make you feel fine about it.
12The case against Godईश्वरासिद्धिः
Sāṅkhya is not silent about God. It argues, and the arguments are pointed.
The milk-and-calf example is doing heavy lifting. Nyāya's argument from design says purposive arrangement requires a designer; Sāṅkhya's counterexample says it does not, and points at lactation. The Naiyāyika reply is that milk flows by God's arrangement too — at which point the argument has become unfalsifiable, and both sides know it.
13The attacksआक्षेपाः
Vedānta — the Brahma-sūtra's principal target
An unconscious pradhāna cannot be the cause of a world so evidently ordered. Milk flows for the calf, you say — but milk flows within a living body governed by an intelligence, so your example proves the opposite. Unconscious things arrange themselves only where something conscious has arranged them.
And your two principles cannot come into relation. They have nothing in common: one is inert and one is inactive; one has parts and one has none. What is the conjunction made of?
Sāṅkhya
The conjunction is beginningless, and the demand for its cause is the demand for a first moment, which satkāryavāda has already ruled out.
Nyāya, on the guṇas
You say pleasure and pain are objective constituents of things — that a garland is pleasant in itself. Then why is the same garland pleasant to the lover, painful to his rival, and a matter of indifference to the ascetic? Pleasure is a quality of a soul, not of a flower.
The Buddhist, briefly
You have an eternal, unchanging, action-less, quality-less witness that also somehow experiences. Say what work the word “witness” is doing that could not be done by the sequence of cognitions itself.
The internal problem nobody solved
Sāṅkhya's own commentators worried at it: if prakṛti evolves for the sake of puruṣa's liberation, and prakṛti is unconscious, then an unconscious thing is acting for an end it cannot conceive on behalf of a being it cannot know about. Vijñānabhikṣu, in the sixteenth century, resolved it by quietly reintroducing God — and was no longer writing Sāṅkhya.
14Legacyपरिणामः
It stopped being a school and became a language
By the medieval period there were few practising Sāṅkhyas. But prakṛti, puruṣa, the three guṇas, the tanmātras and the twenty-five tattvas had been absorbed into almost everything: the Gītā, the Purāṇas, Tantra, Āyurveda, aesthetics and Yoga. It is the most successful failed school in India.
Into Yoga, whole
Yoga takes the metaphysics unchanged and adds a method and an Īśvara. Read the Yoga-sūtra without Sāṅkhya and half of it is unintelligible; read Sāṅkhya without Yoga and it has no practice.
Into medicine
Chapter 13's Āyurveda takes the twenty-four material principles as its account of what a person is made of, and the three guṇas as its account of temperament. The Caraka-saṃhitā's philosophical chapters are Sāṅkhya with adjustments.
What is worth arguing with now
The claim that intellect, ego and mind are material and unconscious, and that consciousness is a distinct thing that merely witnesses them, is a recognisable position in the philosophy of mind — and Sāṅkhya's version of it is unusually clean, because it refuses to let the witness do any explanatory work at all.
15Self-checkपरीक्षा
Check your reading
1 · Why does the Kārikā reject Vedic ritual as a solution?
Sāṅkhya accepts Vedic testimony as a pramāṇa and still rejects what the ritual portion prescribes. Being āstika is about the source of knowledge, not about the programme.
2 · What does satkāryavāda commit Sāṅkhya to?
The atheism of §12 follows from the causal doctrine of §2, not from any independent hostility to religion.
3 · In the twenty-five tattvas, where does the mind sit?
Intellect, ego and mind are all material. The only non-material item is the witness, and it does none of the thinking.
4 · What does Kārikā 62 assert?
The witness was never in trouble. Liberation is the intellect's discovery that the two are two, not a change in the witness.
5 · What is Sāṅkhya's reply to the argument from design?
A counterexample rather than a denial. Nyāya replies that lactation is itself divinely arranged, at which point both sides have stopped being able to lose.
Questions worth arguing about
Can an unconscious nature act for a conscious being's sake?
This is the deepest crack in the system and Sāṅkhya knows it. The milk-for-the-calf example establishes that unconscious processes can serve ends; it does not establish that they can serve an end nobody in the process has any access to. Prakṛti cannot know that puruṣa exists, and puruṣa cannot want anything. Every later commentator patched this differently, and Vijñānabhikṣu's patch was a God.
Are many witnesses better than one?
Sāṅkhya's three arguments all appeal to differences that lie on prakṛti's side, which is the Advaitin's whole point. But Advaita's alternative has its own cost: it must explain why liberation is not universal and instantaneous, and its answer — that the question only arises within the appearance — is either profound or a refusal to answer, depending on where you already stand. The disagreement is a good test of whether you find Advaita's two levels of truth a solution or a manoeuvre.
Is a witness that does nothing worth positing?
The Buddhist question is fair: strip puruṣa of activity, qualities, change and involvement, and ask what is left for it to explain. Sāṅkhya's answer is: the fact that there is experiencing at all rather than merely processing. Whether that is a genuine explanandum or a grammatical illusion produced by the subject-predicate form of the sentence “I see” is a question the two traditions never resolved — and neither has anyone since.
16Glossaryशब्दकोशः
IAST
Devanāgarī
Sense
ahaṃkāra
अहंकार
The I-maker: the principle that appropriates experience as one's own.
avyakta / vyakta
अव्यक्त / व्यक्त
The unmanifest root and its manifest evolutes.
buddhi / mahat
बुद्धि / महत्
Intellect, the first evolute; “the great one”.
guṇa
गुण
A strand or constituent of nature — sattva, rajas, tamas. Not “quality” in the Vaiśeṣika sense.
kaivalya
कैवल्य
Aloneness: the witness standing apart, which is release.
paṅgv-andha-nyāya
पङ्ग्वन्धन्याय
The maxim of the lame man and the blind man.
prakṛti / pradhāna
प्रकृति / प्रधान
Nature: the unconscious, active, single material principle.
pratyaya-sarga
प्रत्ययसर्ग
The intellectual creation: the fifty states of §11.
puruṣa
पुरुष
The conscious witness: inactive, plural, unqualified.
satkāryavāda
सत्कार्यवाद
The doctrine that the effect pre-exists in its cause.
tanmātra
तन्मात्र
“Only that”: a subtle element, the bare sensible quality.
viveka-khyāti
विवेकख्याति
Discriminative discernment of the witness from nature — the operative insight.