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。
On the syllable Oṃ and on breath: how to join them, what to do when tired, what hindrances occur. A practical book, with a precise count of stages and a warning that technique without character corrupts.