On October 31, 1517, an Augustinian professor of theology nailed a list of ninety-five propositions to the door of the Castle Church in Wittenberg. Martin Luther's Ninety-Five Theses challenged the sale of indulgences and questioned the very foundations of papal authority, igniting a movement that would reshape Western Christianity. This modern edition presents Luther's theses and the letters that followed in clear, present-day English, preserving the force and urgency of his original words. Here are the disputation itself, Luther's letters to Archbishop Albrecht of Mainz and Pope Leo X, his German-language Sermon on Indulgences and Grace, and his defense at the Leipzig Debate. Faithful to the meaning and spirit of the original texts, this edition makes a world-famous spiritual classic accessible to today's readers. Part of The Founding Texts Library.