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.

Science fiction, outside of poetry, is the only literary field which has no limits, no parameters whatsoever. You can go not only into the future, but into that wonderful place called other, which is simply another universe, another planet, another species.

I repeat Sturgeon's Revelation, which was wrung out of me after twenty years of wearying defense of science fiction against attacks of people who used the worst examples of the field for ammunition, and whose conclusion was that ninety percent of it is crud.

There are people who have tremendously important things to say, but they say it so poorly that nobody would ever want to read it.

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

An old-shoe lover loves loving old shoes.

I have lived most of my life with the conviction that I don't dream, because I never could retrieve a dream.