I can think of no other author besides John Piper to write on the supremacy of God in preaching. In this book he challenges preachers to keep the "main thing the main thing" in their preaching and teaching ministry. Great resource.
The Supremacy of God in Preaching is one of the few truly indispensable books on gospel ministry. — Phillip Graham Ryken, senior minister, Tenth Presbyterian Church, Philadelphia
The Bible is not a book of practical suggestions on how to live a more well-adjusted life. The Bible is a revelation of God. The Supremacy of God in Preaching reminds preachers of what we easily forget to our peril and the peril of the people in our care. — Haddon Robinson, Gordon-Conwell Theological Seminary