An Open Letter to the Christian Nobility (1520)

According to Wikipedia: "Martin Luther (10 November 1483 18 February 1546) was a German monk, theologian, university professor, Father of Protestantism, and church reformer whose ideas influenced the Protestant Reformation and changed the course of Western civilization. Luther's theology challenged the authority of the papacy by holding that the Bible is the only infallible source of religious authority and that all baptized Christians under Jesus are a universal priesthood. According to Luther, salvation is a gift of God, received only by true repentance and faith in Jesus as the Messiah, a faith given by God and unmediated by the church. At the Diet of Worms assembly over freedom of conscience in 1521, Luther's confrontation with the Holy Roman Emperor Charles V and his refusal to submit to the authority of the Emperor resulted in his excommunication from the Roman Catholic Church and being declared an outlaw of the state as a consequence. His translation of the Bible into the vernacular of the people made the Scriptures more accessible to them, and had a tremendous political impact on the church and on German culture. It furthered the development of a standard version of the German language, added several principles to the art of translation, and influenced the translation of the English King James Bible. His hymns inspired the development of congregational singing within Christianity."