A professor must have a theory as a dog must have fleas.

The essence of science is that it is always willing to abandon a given idea for a better one; the essence of theology is that it holds its truths to be eternal and immutable.

The theory seems to be that as long as a man is a failure he is one of God's children, but that as soon as he succeeds he is taken over by the Devil.

Poetry has done enough when it charms, but prose must also convince.

But where's the wild dog that has praised his fleas?

Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.