Take Sāṅkhya's metaphysics unchanged. Add two things it lacks: a method, and a God who does not create. What results is the only classical Indian school whose central text is a training manual — 195 aphorisms describing what happens to a mind that is progressively stilled, stage by stage, with the obstacles and the false summits marked.
Chapter 13 treated the eight limbs as a health regimen. This page treats the whole system as philosophy.
The name
From yuj, to yoke or join. But the goal is kaivalya, aloneness — so the yoking is of the mind, not a union with anything
Root text
Yoga-sūtraयोगसूत्र of Patañjali, c. 350–450 CE — 195 aphorisms in four chapters
The Yoga-bhāṣya attributed to Vyāsa, c. 5th–6th century. Many scholars now argue that sūtra and bhāṣya are a single composition, the Pātañjala-yogaśāstra
Sāṅkhya's, entire: twenty-five principles, two irreducibles, satkāryavāda, the three strands
What it adds
A graded practice; a theory of mental activity; and Īśvara — hence the old labels seśvara sāṅkhya, Sāṅkhya with a Lord
Goal
kaivalyaकैवल्य, reached through viveka-khyāti, unwavering discriminative discernment
1Three sūtras that set everything upयोगलक्षणम्
The second, third and fourth aphorisms state the method, the result, and what happens the rest of the time. Nothing in the remaining 191 is not an unpacking of these.
Note the economy: three sūtras give a definition, a goal state and a diagnosis, and each is a single compound. The commentary is not optional — “citta”, “vṛtti” and “nirodha” are all technical, and the rest of the first chapter defines them.
2The five kinds of mental activityपञ्च वृत्तयः
If yoga is the stilling of vṛttis, the list of vṛttis must be exhaustive — otherwise something could be left running. Patañjali gives five.
The list is unusual and the first entry is why. A system aiming at truth would keep valid cognition and remove the rest. Yoga removes all five, because the target is not a mind with correct contents but a mind with no contents — the condition under which the witness can be seen not to be the mind.
Each vṛtti is kliṣṭa or akliṣṭa
Every one of the five may be “afflicted” or “unafflicted” — that is, may or may not be entangled with the five afflictions of §4. Unafflicted vṛttis are the ones used to remove the afflicted ones: correct knowledge, disciplined memory, useful conceptual work. The practice is not against mental activity as such but against a particular grip it has, and the last of the unafflicted activities dissolves itself at the end.
3Practice and dispassionअभ्यासवैराग्ये
अभ्यासवैराग्याभ्यां तन्निरोधः ॥
Yoga-sūtra 1.12 — “Their restraint is by practice and dispassion.”
Abhyāsa अभ्यास — practice
Defined as the effort toward steadiness (1.13). Sūtra 1.14 gives the three conditions under which it takes firm hold, and they are the least mystical sentence in the text:
स तु दीर्घकालनैरन्तर्यसत्कारासेवितो दृढभूमिः ॥
dīrgha-kāla — over a long time · nairantarya — without interruption · satkāra — with earnest attention. Long, unbroken, and taken seriously. Miss any of the three and it does not become ground you can stand on.
Vairāgya वैराग्य — dispassion
The mastery of one who has ceased to thirst for objects, seen or heard of (1.15). Note the second clause: it is not enough to be free of what you have had; you must be free of what you have been told about.
And a higher grade. Sūtra 1.16 defines para-vairāgya as the cessation of thirst even for the guṇas — that is, for anything nature can offer at all, including the states this practice produces. Ordinary dispassion gives up objects; the higher gives up the practice's own rewards.
The pair is exactly balanced and the balance is the point. Practice alone builds an ambitious, striving mind. Dispassion alone produces indifference and no capacity. The text keeps them yoked, and every subsequent stage requires both.
4The five afflictionsपञ्च क्लेशाः
अविद्यास्मितारागद्वेषाभिनिवेशाः क्लेशाः ॥
Yoga-sūtra 2.3
The fifth is the most interesting. Abhiniveśa — the will to go on living — is said to be self-sustaining and present even in the wise, which the commentary reads as evidence of past deaths: the fear could not have been learnt in this life by anyone who has not yet died.
pariṇāma-tāpa-saṃskāra-duḥkhair guṇa-vṛtti-virodhāc ca duḥkham eva sarvaṃ vivekinaḥ
Yoga-sūtra 2.15
6A God who creates nothingईश्वरः
Sāṅkhya argued that no God is needed. Yoga takes the same metaphysics and inserts one — but look at what it is.
This is the most minimal theism in Indian philosophy, and it is doing exactly the work Sāṅkhya's objections leave room for. Sāṅkhya's arguments in §12 of the previous page are all against a creator. None of them touches a puruṣa who never got involved.
7The eight limbsअष्टाङ्गम्
Chapter 13 gave the sequence. Here are the contents of the first two, which are where most of the actual instruction is, and which modern practice mostly skips.
Ten commitments before a single posture. Sūtra 2.31's insistence that the restraints hold “regardless of birth, place, time and circumstance” is pointed: it explicitly refuses the exemptions that Dharmaśāstra grants — a soldier's licence to kill, a priest's to sacrifice.
8What each limb is said to yieldफलानि
Sūtras 2.35 to 2.45 attach a specific result to each restraint and observance. The list is worth reading whole, because it mixes the plainly psychological with the frankly extraordinary — and the text does not distinguish them.
Established in…
Sūtra
The stated result
ahiṃsā
2.35
In his presence, hostility is abandoned
satya
2.36
Actions come to rest on their fruits — what he says comes about
asteya
2.37
All jewels present themselves
brahmacarya
2.38
Vigour is gained
aparigraha
2.39
Full knowledge of the how and why of births
śauca
2.40–41
Distaste for one's own body and disinclination to contact others; and then purity of essence, cheerfulness, one-pointedness, mastery of the senses, and fitness for seeing the self
santoṣa
2.42
anuttamaḥ sukha-lābhaḥ — the gaining of unexcelled happiness
tapas
2.43
Perfection of body and senses, through the removal of impurity
svādhyāya
2.44
Communion with one's chosen deity
īśvara-praṇidhāna
2.45
Attainment of absorption
How to read this list
Two readings are defensible and a third is not. You may take the results literally, as the tradition largely did. Or you may read the extraordinary ones as descriptions of how things look from inside a transformed condition — the non-grasping person for whom jewels have lost their pull may reasonably say that all jewels are now available to him. What is not defensible is quietly keeping 2.42 and discarding 2.37 because one is comfortable and the other is not. The text gives them in the same register and the same grammatical form.
9Saṃyamaसंयमः
Limbs six, seven and eight are not three practices but one practice at three depths, and Patañjali gives the compound a name.
The Vibhūti-pāda is a catalogue of what saṃyama on various objects is said to reveal: on the three transformations, knowledge of past and future; on the sound of a word distinguished from its meaning, the speech of all creatures; on the residues, knowledge of former births; on the navel wheel, the arrangement of the body; on the sun, knowledge of the worlds.
10The stages of absorptionसमाधिभेदाः
The most technically precise part of the text, and the reason it is a philosophical document rather than a devotional one. Patañjali distinguishes the stages by what remains present at each.
Read the ladder downwards and it is a progressive stripping: first the word goes, then the gross object, then the subtle one, then the joy, then the sense of being someone, then content altogether. What makes it philosophy rather than description is that each rung is defined by a stated residue, and each residue is one of the items in the metaphysics of the previous page.
11The powers, and the warningविभूतयः
The third chapter lists what saṃyama yields, and the list is long: knowledge of past and future, of former births, of others' minds; invisibility; strength; knowledge of the stars' arrangement; the ability to enter another body. Then, in the middle of the catalogue, sūtra 3.37:
ते समाधावुपसर्गा व्युत्थाने सिद्धयः ॥
te samādhāv upasargā vyutthāne siddhayaḥ
Yoga-sūtra 3.37 — “These are obstacles to absorption, though they are attainments in the outgoing state.”
Why the warning is philosophically serious
It is not modesty. It follows from §10: every power is a capacity of a mind, and every capacity of a mind belongs to prakṛti. To acquire one is to become more richly equipped, and being equipped is precisely the entanglement the practice exists to undo. A yogin who can read minds has a more impressive intellect and is no closer to kaivalya — arguably further, since he now has something to lose.
The point is made again at the end. Sūtra 3.51 says that on being invited by the celestials, one should feel neither attachment nor pride, since the undesirable consequence would recur. And 4.29 defines the final absorption as arising in one who, having discriminative insight, has no interest even in that.
12Kaivalyaकैवल्यम्
13Yoga against Sāṅkhyaभेदाः
Sāṅkhya
Yoga
Principles
Twenty-five
Twenty-five — plus Īśvara, a twenty-sixth that is not a new kind of thing
God
Argued against
A special puruṣa; not a creator; an optional object of practice
Means of release
Discriminative knowledge, reached by reasoning and instruction
The same knowledge, reached by a graded discipline
Mind
Antaḥkaraṇa: intellect, ego and mind as three
Citta: usually treated as one thing with three functions
Attitude to powers
Barely discussed
Catalogued in detail — and then warned against
Attitude to the body
Almost none
Posture, breath and purification are limbs of the path
What it is for
Understanding what is the case
Bringing about a change in a particular mind
The last row is the real difference. Sāṅkhya is a description; Yoga is an intervention. That is why Yoga needs Īśvara — not as a metaphysical necessity but because a practice needs an object and a model, and Sāṅkhya's austere scheme provides neither.
14The Buddhist questionबौद्धसंवादः
The overlap with Buddhist meditation literature is close enough that it has to be addressed directly.
The fourth chapter contains an explicit refutation of the Yogācāra position that objects are not distinct from cognitions — so the text knows its Buddhist neighbours, cites their view accurately, and rejects it. That is better evidence of engagement than of dependence.
15Haṭha yoga is a different thingहठयोगः
The postures most people mean by “yoga” come from a later and largely separate tradition, and the Yoga-sūtra has almost nothing to say about them.
The modern postural forms taught worldwide descend mainly from twentieth-century developments in Mysore and elsewhere, drawing on the Haṭha corpus, on Indian physical culture and on European gymnastics. That history is well documented and worth knowing; it is not the history of this text.
16Self-checkपरीक्षा
Check your reading
1 · Why is valid cognition listed among the mental activities to be stilled?
The first of the five vṛttis. A system aiming at truth would keep it; Yoga is aiming at something else.
2 · What are the three conditions under which practice takes firm hold?
Sūtra 1.14: dīrgha-kāla · nairantarya · satkāra. Miss any of the three and it does not become ground you can stand on.
3 · What is Yoga's Īśvara, precisely?
Which is why he survives Sāṅkhya's objections: all of those are directed at a creator, and none of them touches a puruṣa who never got involved.
4 · Why does the text warn against the powers it has just catalogued?
Sūtra 3.37. The warning follows from the metaphysics, not from modesty.
5 · How should the relation between the Yoga-sūtra and modern postural yoga be described?
“Posture is steady and comfortable” is the whole of the definition. The Haṭha corpus is a genuine and separate body of knowledge, not a commentary on this one.
Questions worth arguing about
Does the eighth limb belong on a ladder with the first?
The eight are presented as a sequence, but they are not obviously the same kind of thing: the first two are ethical commitments, the next three are trainings, and the last three are stages of a single state that arrives rather than being done. Vyāsa treats the first five as “external” and the last three as “internal” limbs, which concedes the point. Whether a single numbered list obscures more than it organises is a fair question, and the tradition itself never treated the numbering as sacrosanct.
Is a state with no content a state of anything?
The Buddhist presses exactly here. If in nirbīja samādhi nothing whatever is present, in what sense is it a condition of a subject rather than simply a gap? Yoga's answer is that the witness is present — but the witness is by definition not an object, so nothing distinguishes its presence from its absence from the inside. The text's own last word is a phrase repeated from its beginning, which may be a sign of a closed circle or of a genuine return.
Can the practice be separated from the metaphysics?
Modern practice mostly assumes it can, and there is a reasonable case: the techniques are described precisely enough to follow, and their proximate effects do not depend on believing in puruṣa. But the text's criterion for progress is metaphysical throughout — each stage of §10 is defined by which tattva remains as content, and the warning of §11 makes sense only if prakṛti is what you are trying to get free of. Strip that out and you still have a discipline; you no longer have a way of telling whether it is working.
17Glossaryशब्दकोशः
IAST
Devanāgarī
Sense
abhyāsa / vairāgya
अभ्यास / वैराग्य
Sustained practice; dispassion. The two means of restraint.
asamprajñāta
असम्प्रज्ञात
Absorption with no object remaining; also nirbīja, seedless.
citta
चित्त
The mind, taken as one thing with several functions.
dharma-megha
धर्ममेघ
“Cloud of dharma”: the final absorption, from which the afflictions cease.
kleśa
क्लेश
An affliction; there are five, rooted in ignorance.
nirodha
निरोध
Restraint or stilling — of the mind's activities, not of the mind.
pratipakṣa-bhāvanā
प्रतिपक्षभावना
Cultivating the opposite of an intrusive thought.
ṛtambharā prajñā
ऋतम्भरा प्रज्ञा
“Insight bearing truth”, arising in clarified subtle absorption.
samāpatti
समापत्ति
Coalescence: the mind taking the form of its object in absorption.
saṃyama
संयम
Concentration, meditation and absorption on one object, taken together.
siddhi / vibhūti
सिद्धि / विभूति
An attainment or power; and an obstacle to absorption.
vṛtti
वृत्ति
A turning or activity of the mind; there are five kinds.