Has it ever occurred to you that Jesus, the master in the art of prayer, would take the trouble to walk up a hill in order to pray? Like all great contemplatives he was aware that the place in which we pray has an influence on the quality of our prayer.
Notice how sharp is the hearing and the sense of touch of a blind man. He has lost his faculty of seeing and this has forced him to develop his other faculties of perception. Something similar happens in the mystical world. If we could go mentally blind, so to speak, if we could put a bandage over our mind while we are communicating with God, we would be forced to develop some other faculty for communicating with him—that faculty which, according to a number of mystics, is already straining to move out to him anyway if it were given a chance to develop: the Heart.