Ātman

Ātman (/ˈɑːtmən/; Sanskrit: आत्मन्) in Hinduism is the true, innermost essence or self of a living being, conceived as eternal and unchanging. Atman is conceptually closely related to the individual self, Jīvātman, which persists across multiple bodies and lifetimes, but different from the self-idea or ego (Ahamkara), the emotional aspect of the mind (Citta), and the bodily or natural aspects (prakṛti). The term is often translated as soul, but is better translated as "Self" or essence. To attain moksha (liberation), a human being must acquire self-knowledge (Atmajnana or Brahmajnana).

The six orthodox schools of Indian philosophy have different views on what this self is. In Samkhya and Yoga, which call the essence purusha, and in Advaita Vedanta, the essence is pure consciousness or witness-consciousness (sakshi), beyond identification with phenomena. In Samkhya and Yoga there are innumerable selves, while in Advaita Vedanta there is only one Self. Prominent views in Vedanta on the relation between (Jīv)Atman and the supreme Self (Paramātmā) or Ultimate Reality (Brahman) are that atman and Brahman are simultaneously different and non-different (Bhedabheda), non-different (Advaita, 'not-two'), different with dependence (Dvaita, 'dualist'), or non-different but with dependence (Vishishtadvaita, qualified non-dualism; see: Ātman-Brahman.