Laughter is the most inexpensive and most effective wonder drug. Laughter is a universal medicine.

To write tragedy, a man must feel tragedy. To feel tragedy, a man must be aware of the world in which he lives. Not only with his mind, but with his blood and sinews.

The mind is a strange machine which can combine the materials offered to it in the most astonishing ways.

Right conduct can never, except by some rare accident, be promoted by ignorance or hindered by knowledge.

Intelligence, it might be said, has caused our troubles; but it is not unintelligence that will cure them. Only more and wiser intelligence can make a happier world

Suppose atomic bombs had reduced the population of the world to one brother and sister; should they let the human race die out?

Christ . . . said that a man who had looked after a woman lustfully had sinned as much as the man who had seduced her. How absurd!