It's just science fiction so it's allowed to be silly, and childish, and stupid. It's just science fiction, so it doesn't have to make sense. It's just science fiction, so you must ask nothing more of it than loud noises and flashing lights.

There is no merit to discipline under ideal circumstances. I must have it in the face of death or it is worthless.

[Social] science fiction is that branch of literature which is concerned with the impact of scientific advance on human beings.

If you have talent, you will receive some measure of success - but only if you persist.

The true delight is in the finding out rather than in the knowing.

It was obvious that bigotry was never a one-way operation, that hatred bred hatred!

And in man is a three-pound brain which, as far as we know, is the most complex and orderly arrangement of matter in the universe.