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 knowledge of Brahman," given by grace: an examination of the syllable Oṃ, the structure of the subtle body, and the path of breath. It ends with the knower being called Puruṣa — a Person, not an impersonal principle.