John Piper is unfailingly passionate, knowledgeable, challenging. In the first half of this brief book he grounds preaching in the glory of God, the cross of Christ and the power of the Spirit. In the second half, he overviews the life of Jonathan Edwards, and then gives ten characteristics of his powerful preaching. Though I do not always agree with Piper, I am deeply moved and stimulated by his writing. This book challenges me to evaluate several aspects of preaching, including humor, intensity, emotion, solemnity and more.