Unknown Important writings Important writings During 1520, Luther completed three important books in which he stated his views. In the first, Address to the Christian Nobility of the German Nation, he urged the German princes to reform the churches and society since the Roman Catholic Church was in such a sad state of corruption. In A Prelude Concerning the Babylonian Captivity of the Church, he attacked the church’s theology of sacraments. Luther maintained there were only two sacraments, baptism and the Lord’s Supper, or at most three, with penance possibly qualifying as a third;10 the Roman Catholic Church taught that there were seven. He also denied the doctrine of transubstantiation.11 The third pamphlet, On the Freedom of a Christian Man, defined Luther’s position on justification and good works.