Klaus Witz, in contrast, traces the history and nature of Bhakti movement to the Upanishadic and the Vedanta foundations of Hinduism. He writes, that in virtually every Bhakti movement poet, "the Upanishadic teachings form an all-pervasive substratum, if not a basis. We have here a state of affairs that has no parallel in the West. Supreme Wisdom, which can be taken as basically non-theistic and as an independent wisdom tradition (not dependent on the Vedas), appears fused with highest level of bhakti and with highest level of God realization."