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.

A scientist may not be sure of the answer, but he's often sure he can find one. And that's a condition which is clearly not enjoyed by philosophy.

A vast technology has been developed to prevent, reduce, or terminate exhausting labor and physical damage. It is now dedicated to the production of the most trivial conveniences and comfort.

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

Teachers must learn how to teach ... they need only to be taught more effective ways of teaching.

I may say that the only differences I expect to see revealed between the behavior of the rat and man (aside from enormous differences of complexity) lie in the field of verbal behavior.

We have not yet seen what man can make of man.