He had learned that close-held secrets could often be cracked by going all the way to the top and there making himself unbearably unpleasant. He knew that such twisting of the tiger's tail was dangerous, for he understood the psychopathology of great power.

If men were the automatons that behaviorists claim they are, the behaviorist psychologists could not have invented the amazing nonsense called 'behaviorist psychology.'

With eternity to draw on there could be no reason for hurrying - 'hurry' was not a concept in Martian.

Men rarely if ever dream up a god superior to themselves. Most gods have the manners and morals of a spoiled child.

The most expensive thing in the world is a second-best military establishment, good but not good enough to win.

Writing is not necessarily something to be ashamed of, but do it in private and wash your hands afterwards.

I'll give you an exact definition. When the happiness of another person becomes as essential to yourself as your own, then the state of love exists.