One of the most famous quotes in all of history is Martin Luther's declaration to the Diet of Worms (the German Congress), in which he said: "Here I stand, I can do no other. God help me. Amen." It was the summation of his refusal to recant his protests of the Roman Catholic Church - and it cemented his central role in the Protestant Reformation, arguably even more than his initial nailing the Ninety-Five Theses to the wall in Wittenberg.
Martin Luther was not a perfect man. No one is perfect, save Jesus himself. But Martin Luther remains an inspiring figure in world history.
If you haven't seen the movie Luther, check out this link. The title character is played by Joseph Fiennes.