The theme of freedom is ever-present for those who inhabit the modern western world. To be free, most people assume, means to be free over and against the state and one's neighbor. But Luther's conception of freedom is decidedly different from the usual story we tell about what it means to be a free human being. For Luther, to be free doesn't mean isolation from or opposition to one's neighbor, but freedom is the kind of liberty that empowers human beings to service of those around them. True freedom comes only from the promise of free grace in Jesus Christ delivered through the preaching of...