 Narayana is presented as the ultimate unchanging truth and reality (Brahman), who pervades the entirety of the universe and is asserted to be the preceptor of all religions.The Pancaratra texts present the "Vyuhas" theory of avatars to explain how the absolute reality (Brahman) manifests into material form of ever changing reality (Vishnu avatar).Vasudeva, state the Pancaratra texts, goes through a series of emanations, where new avatars of him appear.