Ein feste Burg ist unser Gott
Luther's exile is brought to a close with Karlstadt's revolutionary uprising in Wittenberg and the Electorate of Saxony, which causes churches to be desecrated. Luther preaches his "how dare you" ("Invocavit") sermons to restore order to his troubled congregation. In the course of the film, Luther is shown marrying a former nun Katharina von Bora to the delight of his father, who is shown attending the wedding. Luther and Kathie's family room is the scene of Luther holding instructions from his catechism. He is dismayed that he cannot join his fellow reformers in Augsburg as they appear before the diet there in 1530. There the Augsburg Confession is courageously presented to the emperor followed in the film by the pealing of bells, and Luther offering a prayer of thanksgiving to God for his faithfulness to his generation. The film ends with the people of his congregation, young and old, rich and poor alike, singing to him his hymn "A Mighty Fortress Is Our God" in its isometric tune.