The Vedānta system of Indian philo-sophy considers the Brahman/Ātman Principle as the only or the Supreme Reality. All other things, perceived or unperceived, are its manifestations, or, ever subservient to it. The primary purpose of life is to realize this Reality as our true Self. But, all efforts at doing so are being negated by our inordinate attachment to our body-mind complex. Hence this attachment is to be attenuated and ultimately got rid of by sādhana-catuṣṭaya or the fourfold discipline. Ātmānātma-viveka heads this list. It consists in separation (viveka) of the ātman (Self) from all that is anātman (not-Self). The body, the sense-organs, the vital airs, the mind, the intellect, the egoity—none of these is the ātman and hence fit to be brushed aside. Such discrimination and logical thinking gradually leads to the next higher modes of sādhanā and ultimately to the direct experience of the ātman.