We have to abandon the idea that schooling is something restricted to youth. How can it be, in a world where half the things a man knows at 20 are no longer true at 40 - and half the things he knows at 40 hadn't been discovered when he was 20?

The dinosaurs disappeared because they could not adapt to their changing environment. We shall disappear if we cannot adapt to an environment that now contains spaceships, computers - and thermonuclear weapons.

When all else failed, you had to rely on eyeball intrumentation.

Sometimes a decision has to be made by a single individual, who has the authority to enforce it. That's why you need a captain. You can't run a ship by a committee-at least not all the time.

When beauty is universal, it loses its power to move the heart, and only its absence can produce any emotional effect.

I don't believe in God but I'm very interested in her.

Science fiction seldom attempts to predict the future. More often than not, it tries to prevent the future.