Why on earth do you carry a mirror around with you?” “It's purely a defensive device. We seldom quarrel, and this is one of the reasons. Can you imagine yourself getting all worked up and contorted and illogical and then coming face to face with yourself, looking at yourself exactly as you look to everyone else?

Science fiction, outside of poetry, is the only literary field which has no limits, no parameters whatsoever.

If All Men Were Brothers, Would You Let One Marry Your Sister?

Anybody can do anything he wants to if he wants to do it badly enough.

There are a lot of people who write very intensely about things they do not and cannot do.

When you combine something to say with the skill to say it properly, then you've got a good writer.

Corollary 1: The existence of immense quantities of trash in science fiction is admitted and it is regrettable; but it is no more unnatural than the existence of trash anywhere.