“Luther asserted that the doctrine of justification by faith alone is the article on which the church stands or falls, and that this issue touches the very core of the biblical teaching of salvation.” — R.C. Sproul. Today, Martin Luther is known as the man who stood against popes and emperors in defense of the gospel. What drove this lone German monk to defy the Roman Catholic Church? It wasn’t arrogance or ignorance. Luther knew what it meant to live in the darkness of unresolved guilt. Once he discovered that his acceptance before God is a gift received by faith alone in the merits of Christ alone, Luther was set free, and he would not rest until the light of this truth went out to the world. In this book, Dr. R.C. Sproul guides us through several crisis moments in the life of Martin Luther that led to his recovery of the gospel revealed in Scripture. Justification by faith alone was a liberating truth for Luther and the other Protestant Reformers, and it is good news for us to cherish today. Dr. R.C. Sproul (1939–2017) was founder of Ligonier Ministries, an international Christian discipleship organization located near Orlando, Fla. He was also founding pastor of Saint Andrew’s Chapel in Sanford, Fla., first president of Reformation Bible College, and executive editor of Tabletalk magazine. His radio program, Renewing Your Mind, is still broadcast daily on hundreds of radio stations around the world and can also be heard online. Dr. Sproul contributed dozens of articles to national evangelical publications, spoke at conferences, churches, colleges, and seminaries around the world, and wrote more than one hundred books, including The Holiness of God, Chosen by God, and Everyone’s a Theologian. He also served as general editor of the Reformation Study Bible.