Discipleship means following, obeying, acting. Reduction of the Christian life to matters of sentiment or matters of the heart become incomprehensible in the face of biblical teaching . “When God calls a man, he bids him come and die.” Such words from Bonhoeffer’s pen cut us to the quick because eight years after the ink hit the paper Bonhoeffer was hanged at Flossenburg. 

Bonhoeffer was not only a theologian of action but also a man of action, a man of courage.

~ Mark Devine, Bonhoeffer Speaks Today, 46.