The Yoga Sutra of Patanjali is a classic Sanskrit treatise consisting of 195 "threads," or aphorisms, describing the process of liberation through yoga. Although little is known about Patanjali (most scholars estimate that he lived in India circa 200-300 B.C.), his writings have long been recognized as a vital contribution to the philosophy and practice of yoga. This new, expert translation of the original Sanskrit text of Patanjali's best-known work...