The Vedas introduce early conceptions of self that see the individual self (jiva) as connected to and integrated within the cosmic whole (Purusha/Brahman). The Rig Veda's Nasadiya hymn wonders about the origins of existence. The Purusha-Sukta hymn describes the dismembered parts of the cosmic Purusha constituting the universe. Later Upanishads identify the individual atman with the impersonal Brahman, proposing an ultimate non-dual reality beyond distinctions. This shifts the conception of self from an individual to a universal principle while debates continue on the substantiality and nature of self.