“I have indeed inveighed sharply against impious doctrines, and I have not been slack to censure my adversaries on account, not of their bad morals, but of their impiety. And for this I am so far from being sorry that I have brought my mind to despise the judgments of men and to persevere in this vehement zeal, according to the example of Christ, who, in His zeal, calls His adversaries a generation of vipers, blind, hypocrites, and children of the devil. Paul, too, charges the sorcerer with being a child of the devil, full of all subtlety and all malice; and defames certain persons as evil workers, dogs, and deceivers. In the opinion of those delicate-eared persons, nothing could be more bitter or intemperate than Paul's language. What can be more bitter than the words of the prophets? The ears of our generation have been made so delicate by the senseless multitude of flatterers that, as soon as we perceive that anything of ours is not approved of, we cry out that we are being bitterly assailed; and when we can repel the truth by no other pretence, we escape by attributing bitterness, impatience, intemperance, to our adversaries. What would be the use of salt if it were not pungent, or of the edge of the sword if it did not slay? Accursed is the man who does the work of the Lord deceitfully.”
Martin Luther changed the course of Western civilization by initiating the Protestant Reformation. As a priest and theology professor, he confronted indulgence salesmen with his 95 Theses in 1517. Luther strongly disputed their claim that freedom from God's punishment of sin could be purchased with money. His refusal to retract all of his writings at the demand of Pope Leo X in 1520 and the Holy Roman Emperor Charles V at the Diet of Worms meeting in 1521 resulted in his excommunication by the pope and condemnation as an outlaw by the emperor.
Luther taught that salvation is a free gift of God and received only by grace through faith in Jesus as redeemer from sin, not from good works. His theology challenged the authority of the pope of the Roman Catholic Church by teaching that the Bible is the only source of divinely revealed knowledge and opposed sacerdotalism by considering all baptized Christians to be a holy priesthood.
His translation of the Bible into the language of the people (instead of Latin) made it more accessible, causing a tremendous impact on the church and on German culture. It fostered the development of a standard version of the German language, added several principles to the art of translation, and influenced the translation into English of the King James Bible. His hymns inspired the development of singing in churches. His marriage to Katharina von Bora set a model for the practice of clerical marriage, allowing Protestant priests to marry.