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.... They cannot trust anything because they have ceased to know God.
It is not only our hatred of others that is dangerous but also and above an our hatred of ourselves: particularly that hatred of ourselves which is too deep and too powerful to be consciously faced. For it is this that makes us see our own evil in others and unable to see it in ourselves....
As if this were not enough, we make the situation much worse by artificially intensifying our sense of evil, and by increasing our propensity to feel guilt even for things that are not in themselves wrong. In all these ways, we build up such an obsession with evil, both in ourselves and in others, that we waste all our mental energy trying to account for this evil, to punish it, to exorcise it, or to get rid of it in any way we can.
~ Thomas Merton
excerpt from his 1962 essay: The Root of War is Fear