“Cheap grace is the mortal enemy of our church. Our struggle today is for costly grace.” And with that sharp warning to his own church, which was engaged in bitter conflict with the official Nazified state church, Dietrich Bonhoeffer began his book Discipleship (formerly entitled The Cost of Discipleship). Originally published in 1937, it soon became a classic exposition of what it means to follow Christ in a modern world beset by a dangerous and criminal government. At its center stands an interpretation of the Sermon on the Mount: what Jesus demanded of his followers—and how the life of discipleship is to be continued in all ages of the post-resurrection church. “Every call of Jesus is a call to death,” Bonhoeffer wrote. His own life ended in martyrdom on April 9, 1945. Using the acclaimed Dietrich Bonhoeffer Works English translation and adapted to a more accessible format, this new edition features supplemental material from Victoria J. Barnett and an insightful introduction by Geffrey B. Kelly to clarify the theological meaning and social context of this attempt to resist the Nazi ideology.