This is the authoritative text book of Yoga, one of the six systems of Indian philosophy. Sanskrit Text and translation with commentary which provides a full picture of what Yoga is, what its aims are, how it can be practised, and what liberation of the soul means.
All truth is eternal. Truth is nobody's property; no race, no individual can lay any exclusive claim to it. Truth is the nature of all souls.
-Swami Vivekananda