95 Theses: Originally written in 1517, this treasure is perhaps the most important text of the Reformation, at least in terms of impact. These theses are Luther's public arguments against the common practices of the Roman Church, in which he challenges the use of indulgences, the veneration of the Pope, among other things.
The Bondage of the Will: First published in 1525, this masterpiece is Luther's response to "The Diatribe on Free Will" by Desiderius Erasmus. In this book, Luther writes about the depravity of man and the sovereignty of God, especially concerning the salvation of the human race. Luther argues that man is only free to choose what his nature allows him, and therefore, is a slave to his sin until God sovereignly intervenes to save him.
