Nouwen, Henri. In the Name of Jesus. New York: Crossroad, 1989.
Nouwen works from the temptation of Jesus narrative in Matthew, and from his own experience in ministering among the mentally handicapped, to identify for the church and its leaders the real challenges before us: the temptations to power, prestige, prominence, and relevance. A book you will pick up again and again to mold your heart--a relatively easy read.