Father Philippe, in this his first book to be translated from the French, gives a solid theological basis for and approach to mystical, prayer. The doctrinal soundness of his presentation will appeal not only to readers experienced in contemplation but also to those who feel moved to advance, with the guidance of a recognized master. Compassionately mindful of those for whom mysticism is a "misty schism," Father Philippe points out the dangerous pitfalls and devia-tions besetting those on the path to union with God through prayer.