The Large Catechism Author:Martin Luther Martin Luther was a German priest who became the leading figure in the Protestant Reformation in the 16th century. Luther believed that scripture is the final authority on all matters of faith. Luther also wrote some classic Christian books including The Bondage of the Will, Commentary on Galatians, and The Large Catechism. The Large Catechis... more »m is a book in which Luther examines the Ten Commandments, The Lord's Prayer and The Creed in great detail.« less