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 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, 1927