 In the "Chandogya Upanishad", Aruni asks metaphysical questions concerning the nature of reality and truth, observes constant change, and asks if there is something that is eternal and unchanging.From these questions, embedded in a dialogue with his son, he presents the concept of Ātman (soul, Self) and universal Self.The "Ashtavakra Gita", credited to Aṣṭāvakra, examines the metaphysical nature of existence and the meaning of individual freedom, presenting its thesis that there is only one Supreme Reality (Brahman), the entirety of universe is oneness and manifestation of this reality, everything is interconnected, all Self (Atman, soul) are part of that one, and that individual freedom is not the end point but a given, a starting point, innate..