The author of the celebrated devotional work, The Cloud of Unknowing, begins his little book with a prayer that expresses the spirit of the deeper life teaching: "God, unto whom all hearts be open . . . and unto whom no secret thing is hid, I beseech Thee so for to cleanse the intent of mine heart with the unspeakable gift of Thy grace, that I may perfectly love Thee and worthily praise Thee. Amen."