"Upanishad means “sitting down near a teacher to learn” • date around 700 BCE • about the same date as The Yoga Sutras • first descriptions of the subtle body • Bhagavad Gita is considered part of the Upanishads • Focus moves from priests performing rituals to sitting near a teacher to learn each of a series of Hindu sacred treatises written in Sanskrit c. 800–200 BC, expounding the Vedas in predominantly mystical and monistic terms."