“...I don’t try to get outside the man. I try to get inside the murderer. . . . Indeed it’s much more than that, don’t you see? I am inside a man. I am always inside a man, moving his arms and legs; but I wait till I know I am inside a murderer, thinking his thoughts, wrestling with his passions; till I have bent myself into the posture of his hunched and peering hatred; till I see the world with his bloodshot and squinting eyes, looking between the blinkers of his half-witted concentration; looking up the short and sharp perspective of a straight road to a pool of blood. Till I am really a murderer.”

“Oh,” said Mr. Chace, regarding him with a long, grim face, and added: “And that is what you call a religious exercise.”

“Yes,” said Father Brown; “that is what I call a religious exercise.”

After an instant’s silence he resumed: “It’s so real a religious exercise that I’d rather not have said anything about it. But I simply couldn’t have you going off and telling all your countrymen that I had a secret magic connected with Thought-Forms, could I? I’ve put it badly, but it’s true. No man’s really any good till he knows how bad he is, or might be; till he’s realized exactly how much right he has to all this snobbery, and sneering, and talking about ‘criminals,’ as if they were apes in a forest ten thousand miles away; till he’s got rid of all the dirty self-deception of talking about low types and deficient skulls; till he’s squeezed out of his soul the last drop of the oil of the Pharisees; till his only hope is somehow or other to have captured one criminal, and kept him safe and sane under his own hat.”

G.K. Chesterton, The Secret of Father Brown