Inner space is so much more interesting, because outer space is so empty.

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

They say dogs ignore their reflections in mirrors because they can't smell them. Dogs, unlike people, are not fooled by what they see.

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

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.

The movers and shakers have always been obsessive nuts.

Basically, fiction is people. You can't write fiction about ideas.