From DaveBlackOnline (April 8, 2009, 7:52 AM):

The basic thesis of my new book The Jesus Paradigm is that discipleship goes far beyond mere lip service. Like Bonhoeffer, I seek to emphasize Nachfolge — the German title of Bonhoeffer’s Cost of Discipleship. The German word simply means discipleship. Followers of Jesus Christ are expected to, well, “follow” Him! As Bonhoeffer puts it, “Only the believer is obedient, and only the obedient person believes.” (The German original is fantastic: “Nur der Glaubende ist gehorsam, und nur der Gehorsame glaubt.”) Declared righteousness ALWAYS produces practical righteousness if it is genuine.