When I can't do something, this always impels me to study it.

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

If ever you want to touch the hand and the heart of God Almighty, you can do it through the body of someone you love. Anytime. Anywhere. Without no middleman.

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.

Why must we love where the lightning strikes, and not where we choose?

Even if this is the end of humankind, we dare not take away the chances some other life-form might have to succeed where we failed. If we retaliate, there will not be a dog, a deer, an ape, a bird or fish or lizard to carry the evolutionary torch. In the name of justice, if we must condemn and destroy ourselves, let us not condemn all life along with us! We are heavy enough with sins. If we must destroy, let us stop with destroying ourselves!

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.