Priests might divide the world into good and bad. In battle there was strong and weak and nothing else.

You don't just have people who wake up in the morning and say, "What evil things can I do today, because I'm Mr. Evil?" People do things for what they think are justified reasons. Everybody is the hero of their own story, and you have to keep that in mind. If you read a lot of history, as I do, even the worst and most monstrous people thought they were the good guys. We're all very tangled knots.

Aberrations of the human mind are to a large extent due to the obsessional pursuit of some part-truth, treated as if it were a whole truth.

... on the historical scale, the damages wrought by individual violence for selfish motives are insignificant compared to the holocausts resulting from self-transcending devotion to collectively shared belief-systems. It is derived from primitive identification instead of mature social integration; it entails the partial surrender of personal responsibility and produces the quasi-hypnotic phenomena of group-psychology.

Much that may seem evil can be good.

You must be a light unto yourself.