Gli Yoga sutra sono un sistema filosofico indiano dei primi secoli, e consiste di aforismi, come era costume presso i maestri indù, che trasmettevano la loro conoscenza per tradizione orale. Swami Vivekananda, allievo diretto di Sri Ramakrishna e da lui definito Siddha (cioè saggio fin dalla nascita per meriti acquisiti nella vita precedente) ha tradotto dal sanscrito e commentato questo testo.
Patañjali (Devanāgarī पतञ्जलि) (fl. 150 BCE or 2nd c. BCE) is the compiler of the Yoga Sutras, an important collection of aphorisms on Yoga practice, and also the author of the Mahābhāṣya, a major commentary on Pāṇini's Ashtadhyayi. However, it is unlikely that these two works are that of the same author.
In recent decades the Yoga Sutra has become quite popular worldwide for the precepts regarding practice of Raja Yoga and its philosophical basis. "Yoga" in traditional Hinduism involves inner contemplation, a rigorous system of meditation practice, ethics, metaphysics, and devotion to Brahman. At the same time, his Mahābhāṣya, which first foregrounded the notion of meaning as referring to categorization, remains an important treatise in Sanskrit linguistic philosophy.