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。
"The Adamantine Needle" — eleven lines examining who a brahmin is. Body, lineage, birth, learning, and rite are rejected one by one; what remains is a single mark — the vision of the non-dual — and it cannot be inherited.