" What made Luther’s stance so outrageous was not that he valorized the Bible. That is hardly unusual for Christians. What was shocking was that he set it above everything else. He treated the views of the early church fathers, of more recent scholars, even of church councils, with great respect, but he would not be constrained by them. In the end, anything outside the Bible, including anyone else’s interpretation of the Bible, was a mere opinion. This was the true and enduring radicalism of Protestantism: its readiness to question every human authority and tradition. "

― , Protestants: The Faith That Made the Modern World