Never attribute to malevolence what is merely due to incompetence

As his body became more and more defenseless, so his means of offense became steadily more frightful.

The only way to define your limits is by going beyond them.

Now I'm a scientific expert; that means I know nothing about absolutely everything.

Civilization will reach maturity only when it learns to value diversity of character and of ideas.

Across the gulf of centuries, the blind smile of Homer is turned upon our age. Along the echoing corridors of time, the roar of the rockets merges now with the creak of the wind-taut rigging. For somewhere in the world today, still unconscious of his destiny, walks the boy who will be the first Odysseus of the Age of Space.

Look, whispered Chuck, and George lifted his eyes to heaven. (There is always a last time for everything.) Overhead, without any fuss, the stars were going out.