Zimmer in his 1951 Indian philosophies book noted that the Bhakti sub-schools refer to Isvara as a Divine Lord, or the deity of specific Bhakti sub-school. Modern sectarian movements have emphasized Ishvara as Supreme Lord; for example, Hare Krishna movement considers Krishna as the Lord, Brahmoism movement influenced by Christian and Islamic movements in India probably conceptualize Ishvara as a monotheistic all powerful Lord (Brahma). In traditional theistic sub-schools of Hinduism, such as the Vishishtadvaita Vedanta of Ramanuja and Dvaita Vedanta of Madhva, Ishvara is identified as Lord Vishnu/Narayana, that is distinct from the "prakriti" (material world) and "purusha" (soul, spirit).