The Sūtra literature

सूत्र

Also written: sutra literature · what is a sutra · vedic sutras · darshana sutras

Sūtra means thread. A sūtra is a statement compressed to the point where it cannot be shortened without loss — designed to be memorised exactly and unpacked by a teacher. The form exists because the tradition was oral, and memory is expensive.

अल्पाक्षरमसन्दिग्धं सारवद्विश्वतोमुखम्। अस्तोभमनवद्यं च सूत्रं सूत्रविदो विदुः॥

alpākṣaram asandigdhaṁ sāravad viśvato-mukham astobham anavadyaṁ ca sūtraṁ sūtra-vido viduḥ

Few in syllables, unambiguous, full of essence, facing all directions, without padding and without fault — such is a sūtra, say those who know sūtras.

— Traditional definition, Viṣṇudharmottara

The families

Family	Contents
Śrauta Sūtras	The great public sacrifices — Āpastamba, Baudhāyana, Kātyāyana, Āśvalāyana and others
Gṛhya Sūtras	Household rites and the sixteen saṃskāras
Dharma Sūtras	Conduct and law — the oldest layer of the Dharma Śāstra
Śulba Sūtras	Altar geometry
Darśana Sūtras	Nyāya (Gautama), Vaiśeṣika (Kaṇāda), Sāṅkhya (Kapila, via the Kārikā), Yoga (Patañjali), Pūrva Mīmāṁsā (Jaimini), Brahma Sūtra (Bādarāyaṇa)
Grammatical	Pāṇini's Aṣṭādhyāyī — the supreme example of the form
Bhakti Sūtras	Nārada Bhakti Sūtra and Śāṇḍilya Bhakti Sūtra — devotion analysed as rigorously as logic

Two sūtras, and what compression actually looks like

The definition above is easy to admire and hard to picture. Take the first aphorism of the Nyāya Sūtra, which is a single sentence containing one enormous compound.

प्रमाणप्रमेयसंशयप्रयोजनदृष्टान्तसिद्धान्तावयवतर्कनिर्णयवादजल्पवितण्डाहेत्वाभासच्छलजातिनिग्रहस्थानानां तत्त्वज्ञानान्निःश्रेयसाधिगमः।

pramāṇa-prameya-saṁśaya-prayojana-dṛṣṭānta-siddhānta-avayava-tarka-nirṇaya-vāda-jalpa-vitaṇḍā-hetvābhāsa-chala-jāti-nigrahasthānānāṁ tattva-jñānān niḥśreyasādhigamaḥ

From true knowledge of the means of knowledge, the knowable, doubt, purpose, example, established doctrine, the members of an argument, hypothetical reasoning, ascertainment, discussion, wrangling, cavil, fallacies of the reason, quibbling, futile rejoinders and the grounds of defeat — from true knowledge of these sixteen comes the attainment of the highest good.

— Nyāya Sūtra 1.1.1 (Gautama)

Sixteen categories, in a fixed order, in one sentence, and the entire remaining text of the Nyāya Sūtra is the expansion of that list in exactly that sequence. The sūtra is therefore a table of contents, a definition of the discipline and a soteriological claim at once — the claim being the last four words: knowing these sixteen things truly leads to the highest good. A logic manual that ends its first sentence with liberation is telling you what logic was for.

Patañjali achieves the same thing in four words, and it is the most famous sūtra in the language.

योगश्चित्तवृत्तिनिरोधः।

yogaś citta-vṛtti-nirodhaḥ

Yoga is the stilling of the movements of the mind-stuff.

— Yoga Sūtra 1.2 (Patañjali)

Every word is load-bearing and every word has been fought over for fifteen centuries. Citta — is it Sāṅkhya's inner instrument, or something wider? Vṛtti — movement, modification, or the specific five listed in the next sūtra? Nirodha — suppression, restraint, or cessation? And the sūtra is deliberately incomplete: it says what yoga is but not what happens then, which is supplied by 1.3, tadā draṣṭuḥ svarūpe'vasthānam — 'then the seer abides in its own nature'. The two sūtras together are eight words and constitute the whole of the system's goal; the remaining 194 aphorisms are method.

The Sūtra literature

The families

Two sūtras, and what compression actually looks like

The sources of knowledge in Sanātana Dharma

Śruti — that which was heard

Smṛti — that which was remembered

Nigama and Āgama — the two revealed streams

The four Vedas

Ṛgveda