Dogmatism is the greatest of mental obstacles to human happiness.

The greatest challenge to any thinker is stating the problem in a way that will allow a solution.

Every man, wherever he goes, is encompassed by a cloud of comforting convictions, which move with him like flies on a summer day.

There can't be a practical reason for believing something that is not true.

I hate the world and almost all the people in it. I hate the Labour Congress and the journalists who send men to be slaughtered, and the fathers who feel a smug pride when their sons are killed, and even the pacifists who keep saying human nature is essentially good, in spite of all the daily proofs to the contrary. I hate the planet and the human race—I am ashamed to belong to such a species.

Physics is mathematical not because we know so much about the physical world, but because we know so little; it is only its mathematical properties that we can discover.

No Carthaginian denied Moloch, because to do so would have required more courage that was required to face death in battle.