During the interval between the Leipzig Debate in 1519 and the dramatic, decisive Diet of Worms in 1521, Luther faced a wide array of major problems. He was forced to defend the emerging Reformation against its secular and ecclesiastical enemies and to clarify his own position. At the same time he had to address himself to a host of friends, supporters, and sympathizers who were apprehensive about where Luther's theology was leading. It was during this critical period that the writings contained in this volume were written.