At the root of all war is fear: not so much the fear men have of one another as the fear they have of everything. It is not merely that they do not trust one another; they do not even trust themselves. If they are not sure when someone else may turn around and kill them, they are still less sure when they may turn around and kill themselves. They cannot trust anything, because they have ceased to believe in God.
— Thomas Merton, Thomas Merton: Essential Writings by Thomas Merton, Christine M. Bochen, editor