This volume includes the texts of Erasmus's 1524 diatribe against Luther, De Libero Arbitrio, and Luther's violent counterattack, De Servo Arbitrio. E. Gordon Rupp and Philip Watson offer commentary on these texts as well. Long recognized for the quality of its translations, introductions, explanatory notes, and indexes, the Library of Christian Classics provides scholars and students with modern English translations of some of the most significant Christian theological texts in history. Through these works--each written prior to the end of the sixteenth century--contemporary readers are able to engage the ideas that have shaped Christian theology and the church through the centuries.