Heretics cannot themselves appear good unless they depict the Church as evil, false, and mendacious. They alone wish to be esteemed as the good, but the Church must be made to appear evil in every respect.
Notes from Wikiquote
Denifle, Heinrich, Luther and Lutherdom, p. 15; primary source: D. Martin Luthers Werke: kritische Gesamtausgabe, Weimar, Herman Bohlau, 1883, Vol. 3, p. 445.