When man learns to understand and control his own behavior as well as he is learning to understand and control the behavior of crop plants and domestic animals, he may be justified in believing that he has become civilized.

It was the greatest sensation of existence: not to trust but to know.

Self-esteem is reliance on one's power to think. It cannot be replaced by one's power to deceive. The self-confidence of a scientist and the self-confidence of a con man are not interchangeable states, and do not come from the same psychological universe. The success of a man who deals with reality augments his self-confidence. The success of a con man augments his panic.

It is not death that we wish to avoid, but life that we wish to live.

The difference between a welfare state and a totalitarian state is a matter of time.

The only proper functions of a government are: the police, to protect you from criminals; the army, to protect you from foreign invaders; and the courts, to protect your property and contracts from breach or fraud by others, and to settle disputes by rational rules, according to objective law.

An inventor is a man who asks 'Why?' of the universe and lets nothing stand between the answer and his mind.