In 1517, this cranky professor of moral theology was so upset by corruption within the reigning power structure that he risked everything to challenge it. Martin Luther’s complaint exposed the corrupt Papal practice of selling indulgences in exchange for the absolution of sins. When his complaint went uncorrected he nailed his objections (95 Theses) to the door of the Cathedral at Wittenberg, leading ultimately to the Protestant Reformation.
Oh please… Martin Luther, please come back. We need you.