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 survey of the whole of yoga in four kinds — mantra, laya, haṭha, and rāja — with a description of the stages, hindrances, and signs of success. It ends with the word "service": the practice is named not work for oneself, but service.