Carson and Keller serve as editors of a new series of booklets from The Gospel Coalition, a group designed to clearly define and execute the Christian message in our modern-day world. These men also co-wrote this initial book, which explains the basis of the gospel and the impetus it has in creating lives centered on Christ-honoring doctrine and conduct. While necessarily brief, they explain how gospel-centered ministry is biblically mandated and absolutely indispensable for God’s people.