I found this interesting in the latest New Yorker...

"I see that a man I know to be a ruffian is pursuing a young girl,” Leo Tolstoy wrote in “The Kingdom of God Is Within You.”“I have a gun in my hand—I kill the ruffian and save the girl. But the death or the wounding of the ruffian has positively taken place, while what would have happened if this had not been I cannot know. And what an immense mass of evil must result, and indeed does result, from allowing men to assume the right of anticipating what may happen. Ninety-nine per cent of the evil of the world is founded on this reasoning—from the Inquisition to dynamite bombs.”

To read more, go to this article.