This volume offers a unique approach to the study of the great German reformer, Martin Luther. Robert Kolb and Charles Arand offer an introduction to two significant themes that form the heart of Luther's theology. The first theme concerns what it means to be truly human. For Luther, "passive righteousness" described the believer's response to God's grace. But there was also an "active righteousness" that defined the relationship of the believer to the world. The second theme involves God's relation to his creation through his Word, first creating and then redeeming the world. Clergy and general readers will find here a helpful introduction to Luther's theology and its continuing importance for applying the good news of the gospel to the contemporary world.