A well-researched study of ways in which the Reformation affected the interpretation of the Gospel of John, focusing on Melanchthon's Annotationnedsin Johannem, 1523, wich the author sees as a literary landmark. The influence of medieval and humanist commentators as well as of Luther's sermons is studied, revealing that, while Melanchthon did make use of their theological ideas, his exegesis was nonetheless determined by his own theories of rhetoric and logic.