The will is a beast of burden. If God mounts it, it wishes and goes as God wills; if Satan mounts it, it wishes and goes as Satan wills; Nor can it choose its rider - the riders contend for its possession.
If ever a monk could get to heaven through monastic discipline, I was that monk. And yet my conscience would not give me certainty, but I always doubted and said, 'You didn't do that right. You weren't contrite enough. You left that out of your confession.' The more I tried to remedy an uncertain, weak, and troubled conscience with human traditions, the more I daily found it more uncertain, weaker, and more troubled.
If the devil were wise enough and would stand by in silence and let the Gospel be preached, he would suffer less harm. For when there is no battle for the Gospel it rusts and it finds no cause and no occasion to show its vigor and power. Therefore, nothing better can befall the Gospel than that the world should fight it with force and cunning.
The world is a den of murderers, subject to the devil. If we desire to live on earth, we must be content to be guests in it, and to lie in an inn where the host is a rascal, whose house has over the door this sign or shield, 'For murder and lies.'