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 first half is Vaiṣṇava prose on the syllable Oṃ and on Viṣṇu; the second, verses on non-duality. The book's worth lies in how these two voices come together. It ends with a promise to one who "does not return again."