The year 2017 marks the 500th anniversary of one of the most important events in history. In 1517 in Wittenberg, the German monk and theologian Martin Luther posted on the door of the town’s church his “Ninety-Five Theses.†The event lit the match that ignited the Protestant Reformation. Luther was a prolific writer, and many of his works stand out as important theological statements and contributions to Reformed Protestantism. However, of all books that he wrote, Luther himself believed that the two most important were his Large Catechism and The Bondage of the Will. The Bondage of the Will discusses in great detail the issue of whether humans have free will in spiritual matters. Luther emphasized scripture and what he considered a proper understanding of it. The Bondage of the Will is one of the fullest discussions that theology has ever produced about this important issue. It is essential reading if one wishes to understand the role of free will in a person’s relationship with God.