The Noble Eightfold Path & the eight limbs of yogaTwo eightfold ways out of the same Indian soil — the Buddha's ariya aṭṭhaṅgika magga and Patañjali's aṣṭāṅga yoga, set side by side step by step: what they share, where they part, and how both support practice.

Broad overview — the map Both systems count eight limbs and lead in the same basic movement: from the ethical foundation, through the gathering of body and mind, into deep meditative absorption. Yet the goal towards which this absorption runs is a different one in each tradition. The following map shows the structure first — the depth follows in Parts 2–4. KNOWLEDGE The threefold division of the path into sīla–samādhi–paññā is canonical: in the Cūḷavedalla-Sutta the nun Dhammadinnā assigns the eight limbs to exactly these three "aggregates" (khandha) MN 44. The twofold division of yoga into outer and inner limbs is likewise Patañjali's own: trayam antaraṅgaṃ pūrvebhyaḥ — "the three [last] are inner limbs in relation to the preceding ones" YS 3.7. The three layers compared — a first glance Layer Eightfold Path Aṣṭāṅga Yoga Relation Ethics / foundation Right speech, action, livelihood (sīla) Yama & niyama (restraints, observances) Strong overlap — almost identical rules of conduct Body / preparation (no limb of its own; contained in the practice of mindfulness of breathing) Āsana, prāṇāyāma, pratyāhāra Yoga gives the preparation of the body limbs of its own Concentration / absorption Effort, mindfulness, concentration (jhāna) Dhāraṇā, dhyāna, samādhi Phenomenologically very similar (dhyāna = jhāna) Goal Nibbāna — the going out of greed, hatred, delusion; insight into not-self Kaivalya — isolation of the eternal Decisive separation — see Part 4 Noble Eightfold Path

The Noble Eightfold Path ariya aṭṭhaṅgika magga The path is the fourth of the Four Noble Truths: the way that leads to the dissolution of suffering. In the Dhammacakkappavattana-Sutta, the first discourse, the Buddha presents it as majjhimā paṭipadā — the middle way between devotion to sensual pleasure (kāmasukhallikānuyoga) and self-torment (attakilamathānuyoga) SN 56.11. "This, monks, is the middle way awakened to by the Perfected One — which gives vision, gives knowledge, which leads to peace, to higher knowledge, to awakening, to nibbāna: just this noble eightfold path." Dhammacakkappavattana-Sutta · SN 56.11 (in substance) KNOWLEDGE The analytical definitions of the eight limbs stand word for word in the Vibhaṅga-Sutta (Magga-Saṃyutta) SN 45.8 and in the Saccavibhaṅga-Sutta MN 141. The explanations that follow render these definitions. The three groups of training (tisso sikkhā) The path is divided not into a rigid sequence but into three fields of training that carry one another. Wisdom (limbs 1–2) stands at once at the beginning — as orientation — and at the end — as ripe fruit. MN 44 ▸ Paññā — wisdom (limbs 1–2) 1 · Right view — sammā-diṭṭhi. The knowledge of suffering, of its arising, of its going out and of the way leading there — that is, insight into the Four Noble Truths. SN 45.8 The Buddha distinguishes two levels MN 117: worldly right view (sāsava — still attended by taints: the understanding of kamma and its fruits) and supramundane right view (anāsava — the liberating wisdom in the path moment itself). Right view is the "forerunner" (pubbaṅgama) of all the other limbs. 2 · Right intention — sammā-saṅkappa. Three wholesome orientations of thinking: renunciation (nekkhamma-saṅkappa), non-ill-will / goodwill (abyāpāda) and non-harming / compassion (avihiṃsā). SN 45.8 They are the direction of will that proceeds of itself from right view. ▸ Sīla — virtue (limbs 3–5) 3 · Right speech — sammā-vācā. Abstaining from lying (musāvāda), from divisive speech (pisuṇā vācā), from harsh speech (pharusā vācā) and from idle chatter (samphappalāpa). SN 45.8 4 · Right action — sammā-kammanta. Abstaining from killing (pāṇātipāta), from taking what is not given (adinnādāna) and from sexual misconduct (kāmesu micchācāra). SN 45.8

5 · Right livelihood — sammā-ājīva. To earn one's living by honest means, avoiding wrong acquisition. Concretely the canon names five kinds of trade to be avoided: weapons, living beings, meat, intoxicants and poison AN 5.177. ▸ Samādhi — concentration (limbs 6–8) 6 · Right effort — sammā-vāyāma. The four right exertions (sammappadhāna): to prevent unarisen unwholesome states, to overcome those arisen, to arouse unarisen wholesome states, to maintain and ripen those arisen. SN 45.8 7 · Right mindfulness — sammā-sati. The four pillars of mindfulness (satipaṭṭhāna): contemplation of body (kāya), feelings (vedanā), mind (citta) and mind-objects (dhammā) — in each case "keen, clearly knowing, mindful, having overcome desire and grief regarding the world". DN 22 / MN 10 8 · Right concentration — sammā-samādhi. The four absorptions (jhāna). The first jhāna: secluded from sensual desire and unwholesome states, with the taking up and holding of thought (vitakka-vicāra), with rapture and happiness born of seclusion (pītisukha); then increasing stilling up to the fourth jhāna: beyond pleasure and pain, purity of equanimity and mindfulness (upekkhā-sati-pārisuddhi). SN 45.8 The most important insight for practice: the path as a spiral, not as a staircase CONJECTURE (an attested interpretation, not a literal statement of the suttas) — The eight limbs are often misunderstood as steps. For teaching purposes they unfold as sīla → samādhi → paññā; yet in the moment of awakening (magga-citta) all eight arise together according to the Abhidhamma analysis. In practice this means: one begins with a worldly right view, trains in virtue and concentration, and this training ripens the view into the supramundane one. The path winds upward — the limbs strengthen one another reciprocally. Extension to the tenfold path. For the perfected one (asekha, the "no longer training") MN 117 names two further limbs: right knowledge (sammā-ñāṇa) and right liberation (sammā-vimutti) — the eightfold becomes the tenfold path (dasa-aṅga). This is probably the source of a feeling of "eight or more" — on which see Part 5.

The eight limbs of yoga aṣṭāṅga yoga · Pātañjala Yogasūtra Patañjali's Yogasūtra is one of the six orthodox (āstika) systems of teaching in India, closely bound up with Sāṃkhya philosophy. Its goal is kaivalya — the "aloneness" or isolation of pure consciousness (puruṣa) from nature (prakṛti). The famous definition: yogaś citta-vṛtti-nirodhaḥ — "Yoga is the bringing to rest of the movements of the mind" YS 1.2. CONJECTURE Dating. The Yogasūtra (or rather the Pātañjalayogaśāstra, sūtra together with the old commentary) is mostly placed around 350–450 CE (Ph. Maas: c. 400 CE); depending on the scholar the range runs from the 2nd century BCE to the 5th century CE. The Eightfold Path is markedly older (the Buddha's teaching, 5th century BCE; the texts redacted over the following centuries). Exact dates are uncertain and are given here as a range. yama-niyama-āsana-prāṇāyāma-pratyāhāra-dhāraṇā-dhyāna-samādhayo 'ṣṭāv aṅgāni "Restraint, observance, seat, guidance of the breath, withdrawal of the senses, binding, meditation, absorption — these are the eight limbs." Yogasūtra · YS 2.29 The five outer limbs (bahiraṅga)

Systematic comparison 4.1 · The ethical layer — strong overlap The yama coincide strikingly with Buddhist sīla. The following assignment is my own juxtaposition, not an equation of the texts themselves: CONJECTURE (the author's assignment — the texts themselves do not expressly set these pairs side by side) Yama (yoga) Sīla / path (Buddhism) Overlap ahiṃsā — non-harming Not killing pāṇātipātā veramaṇī + avihiṃsā-saṅkappa very high satya — truthfulness Right speech / not lying musāvādā veramaṇī very high asteya — non-stealing Not taking what is not given adinnādānā veramaṇī very high brahmacarya — continence Avoiding sexual misconduct / celibacy abrahmacariya high aparigraha — non-grasping Non-greed alobha, renunciation nekkhamma (no single precept) thematic KNOWLEDGE These five yama are nearly identical with the five great vows (mahāvrata) of Jainism. That points to a common pan-Indian ethical substratum of the ascetic (śramaṇa) movements, from which all three traditions draw — not necessarily to direct borrowing between yoga and Buddhism. The niyama have looser correspondences: santoṣa (contentment) is echoed in monastic santuṭṭhi, tapas and svādhyāya in the ascetic and studious traits. One correspondence, however, is entirely absent: īśvara-praṇidhāna, devotion to a Lord/God. Buddhism knows no Īśvara to whom one surrenders — a first sharp point of separation. 4.2 · The meditative layer — same phenomenology, same root KNOWLEDGE dhyāna (Sanskrit) and jhāna (Pāli) are the same word, both from the root √dhyai (to muse, to meditate). The movement "binding → flow → absorption" (dhāraṇā–dhyāna–samādhi) describes phenomenologically the same deepening of concentration as the series of jhāna. The structural place, however, is different: in yoga samādhi (especially nirbīja) is itself the vehicle to the goal. In Buddhism sammā-samādhi is not the goal but the foundation (samatha) for insight (vipassanā) and wisdom (paññā), which alone uproot the taints. Concentration serves, wisdom liberates.

4.3 · The decisive separation — kaivalya against nibbāna Here lies the real difference, and it is metaphysical, not technical: Common stem Ethics · withdrawal of the senses · concentration · dhyāna/jhāna · a discriminating cognition Yoga → kaivalya Liberation = recognising puruṣa (eternal, pure consciousness, the true self) as different from nature. Kaivalya is the isolation of this eternal self. A self-affirming (ātman/puruṣa) metaphysics. Buddhism → nibbāna Liberation = insight into anattā (not-self), anicca, dukkha. Nibbāna is not the setting free of an eternal self, but the going out of craving, of clinging and of the conceit "I am". An abiding self is expressly denied. Put pointedly: at the end, yoga finds a self that was pure from the beginning; at the end, Buddhism sees through the fact that no such abiding self exists. The same terms (samādhi, dhyāna) denote the same process — but the goal is opposed. Whoever practises both must choose this view consciously; the technique can be shared, the view cannot. 4.4 · Structure — series against integrated moment Question Eightfold Path Aṣṭāṅga Yoga Sequence the limbs ultimately arise simultaneously (path moment); as training, divided in three more strongly progressive (āsana before prāṇāyāma, etc.); outer before inner limbs Body no limb of its own; within the kāya part of mindfulness limbs of its own (āsana, prāṇāyāma) Relation to God non-theistic; no Īśvara devotion to Īśvara as an observance (niyama) Liberating knowledge insight into anattā/anicca/dukkha viveka-khyāti: puruṣa ≠ prakṛti Status of the goal concentration serves wisdom samādhi is itself the vehicle to the goal 4.5 · Philological note — the word "limb" KNOWLEDGE Both systems carry the numeral eight and the word "limb" in their name: aṭṭha-aṅga (Pāli) and aṣṭa-aṅga (Sanskrit) are cognate; aṅga = limb, component. Both are called literally "eight-limbed".

CONJECTURE Whether this agreement in the "eight-limbed" scheme means direct borrowing is uncertain and disputed. Since the Buddhist formula is markedly older than Patañjali's text, the direction — if there was influence — would more plausibly run from the older śramaṇa usage into the later systematisation of yoga. Just as well, the number and the image may have arisen independently. I assert no borrowing here.

The question "eight or nine?" Briefly and clearly: Patañjali's system has eight limbs — the name aṣṭāṅga ("eight-limbed") fixes the number. There is no canonical "ninth limb" in the Yogasūtra. KNOWLEDGE YS 2.29 enumerates exactly eight limbs and calls them expressly "aṣṭāv aṅgāni" — eight limbs. There are no more. Where might the number "nine" come from? Two possibilities: a) Confusion with the Buddhist side On the Buddhist side there really is "more than eight": for the perfected one the eightfold becomes the tenfold path — right knowledge (sammā-ñāṇa) and right liberation (sammā-vimutti) are added MN 117. A dim memory of "the path can have more limbs" most likely comes from here — though then there are ten, not nine. b) Later or school-internal counts CONJECTURE Individual later Haṭha or tantric school traditions count the limbs of yoga differently; some lines of teaching add a preparatory limb. But that is not the classical system of Patañjali. If you have a particular source for "nine limbs" in mind (a specific text, say, or a lineage), name it to me — I am inventing no nine-limb scheme here, but hold to this: classically there are eight. Conclusion on the question: yoga = 8 (fixed by the name). Buddhism = 8 for the practitioner, 10 for the perfected one. The "9" has no fixed place in the classical stock of either system.

For practice Not only to think, but to practise. Three insights that make both systems fruitful for daily practice — and one that must be kept awake. 6.1 · Why ethics is not a preface but the foundation of concentration Both ways put ethics at the beginning, and for a practical, not a moral reason: a mind churned up by remorse and a bad conscience does not gather. The canon describes this as a causal chain: virtue → non-remorse (avippaṭisāra) → gladness (pāmojja) → rapture (pīti) → stillness → happiness → concentration (samādhi). cf. AN 10.1 / AN 11.1 In practice: yama and sīla — to live non-violently, truthfully, without taking, in measure — are the condition for the mind to settle at all while sitting. Whoever seeks concentration begins not on the cushion but in conduct between the sittings. 6.2 · Pratyāhāra and satipaṭṭhāna in daily life Withdrawal of the senses (pratyāhāra) and mindfulness (sati) interlock. In daily life this means: not letting the senses run automatically after their objects, but staying mindful at sense contact — exactly the training of the four satipaṭṭhāna in body, feeling, mind and mind-objects. Both traditions teach the same gate: the gap between stimulus and reaction. 6.3 · A sensible interplay of the two systems CONJECTURE (a practical suggestion, no canonical prescription) — The strengths can be joined without mixing the systems: Bodily preparation from yoga: āsana and prāṇāyāma as a support, to make the body still and the breath calm before one sits. Yoga has worked out this preparation most finely. Concentration as common ground: the deepening of concentration (jhāna/dhyāna) — here both speak the same language. Liberating work from Buddhism: the training of insight (satipaṭṭhāna → vipassanā) for seeing through impermanence, unsatisfactoriness and not-self. 6.4 · The watchfulness one may not give up Sharing technique yes — confusing the view no. Whoever practises concentration and thereby means to lay bare an eternal pure self (the kaivalya view) is practising something different from one who in that same concen• • •

tration sees through precisely the assumption of such a self (the anattā view). Both use dhyāna/jhāna; but where it leads is decided by the view with which one practises. Keeping this distinction awake is itself part of the practice — it protects against a quiet blending of terms. 6.5 · A brief map of practice When the mind… …help from yoga …help from Buddhism is restless in the body āsana, prāṇāyāma mindfulness of the body (kāyānupassanā) is pulled by sense stimuli pratyāhāra guarding the sense doors, sati at contact is scattered dhāraṇā (binding to an object) ānāpānasati (concentration on the breath) seeks stability dhyāna → samādhi jhāna as the samatha foundation seeks liberation viveka-khyāti (the puruṣa view) vipassanā: anicca, dukkha, anattā

Sources and references Buddhist primary sources (Pāli canon) Sigil Text Relevance here SN 56.11 Dhammacakkappavattana-Sutta the first discourse; the middle way, the eightfold path, the Four Truths SN 45.8 Vibhaṅga-Sutta (Magga-Saṃyutta) literal definitions of all eight limbs MN 141 Saccavibhaṅga-Sutta Sāriputta's analysis of the Four Truths together with the path MN 44 Cūḷavedalla-Sutta Dhammadinnā: the assignment of the limbs to sīla–samādhi–paññā MN 117 Mahācattārīsaka-Sutta worldly/supramundane; right view as forerunner; the tenfold path DN 22 / MN 10 (Mahā-)Satipaṭṭhāna-Sutta the four pillars of mindfulness (right mindfulness) AN 5.177 Vaṇijjā-Sutta the five kinds of trade to be avoided (right livelihood) AN 10.1 / 11.1 the Kimatthiya series virtue → non-remorse → … → concentration Yoga primary source Sigil Locus Relevance here YS 1.2 citta-vṛtti-nirodhaḥ definition of yoga YS 1.17–18 saṃprajñāta / asaṃprajñāta kinds of samādhi YS 2.26 viveka-khyāti discriminating cognition as the means of liberation YS 2.29 aṣṭāv aṅgāni enumeration of the eight limbs YS 2.30–32 yama / mahāvrata / niyama the ethical limbs in detail YS 2.46–54 āsana, prāṇāyāma, pratyāhāra outer limbs 3–5 YS 3.1–4 dhāraṇā, dhyāna, samādhi, saṃyama inner limbs 6–8 and their unity YS 3.7–8 antaraṅga / bahiraṅga inner vs. outer limbs; nirbīja samādhi

CONJECTURE / note on secondary literature On the dating of the Pātañjalayogaśāstra: Ph. A. Maas, "Pataṅjali's Yoga Reconsidered" (the state of research, around 400 CE). This statement is scholarly opinion, not a finding from primary sources. The references given here follow the usual sūtra/sutta numbering; translations render the sense and are not quoted verbatim from any particular edition. Note on method. All statements marked KNOWLEDGE are covered by the primary passages named. Assignments between the two systems (Part 4.1), questions of historical influence (4.5) and datings (Part 3) are marked CONJECTURE, because they concern interpretation or an uncertain state of research. Where a concrete nine-limb source exists, please supply it — it has deliberately not been invented here.