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 how it all began: the Ātman is one, and He creates the worlds, forms the person, and enters him — and the person forgets who is within him. It ends with a saying that became one of the great utterances: "knowledge is Brahman."