Madhvācārya's teachings are built on the premise that there is a fundamental difference between Atman (individual soul, self) and the Brahman (ultimate reality, God Vishnu), these are two different unchanging realities, with individual soul dependent on Brahman, never identical. His school's theistic dualism teachings disagreed with the monist teachings of the other two most influential schools of Vedanta based on Advaita's nondualism and Vishishtadvaita's qualified nondualism. Liberation, asserted Madhva, is achievable only through the grace of God. The Dvaita school founded by Madhva influenced Vaishnavism, the Bhakti movement in medieval India, and has been one of the three influential Vedānta philosophies, along with Advaita Vedanta and Vishishtadvaita Vedanta. Madhva's historical influence in Hinduism, states Kulandran and Kraemer: has been salutary, but not extensive.