奥义书——吠陀传统的哲学核心，阐明梵、真我、知识、行动与解脱的本质。十部主要奥义书，另加精选的毗湿奴派小奥义书。
A book on renunciation: where to seek the holy place (within, not on a map), when a person has the right to leave home, and what one who cannot perform the rites should do. Hence the rule: one leaves not by age, but "on the day dispassion has come."