Old age is rather like another country. You will enjoy it more if you have prepared yourself before you go.

Society attacks early, when the individual is helpless.

Behavior is determined by its consequences.

If the world is to save any part of its resources for the future, it must reduce not only consumption but the number of consumers.

Science, not religion, has taught me my most useful values, among them intellectual honesty. It is better to go without answers than to accept those that merely resolve puzzlement.

The one fact that I would cry form every housetop is this: the Good Life is waiting for us - here and now.

We have seen that in certain respects operant reinforcement resembles the natural selection of evolutionary theory. Just as genetic characteristics which arise as mutations are selected or discarded by their consequences, so novel forms of behavior are selected or discarded through reinforcement.