From Martin Luther’s Works, Vol. 51, 77:
I opposed indulgences and all the papists, but never with force. I simply taught, preached, and wrote God’s Word; otherwise I did nothing. And while I slept, or drank Wittenberg beer with my friends Philip and Amsdorf, the Word so greatly weakened the papacy that no prince or emperor ever inflicted such losses upon it. I did nothing; the Word did everything.