“The patrists poison themselves. The matrists tend to decay, which is merely another kind of poison.”

“Let me tell you something: you can not write good fiction about ideas. You can only write good fiction about people.”

“Does anyone ask a painter -- even the painter himself -- why he paints? Now me, I painted... used to... whatever I saw that was beautiful. It had to be beautiful to me, through and through, before I would paint it. And I used to be a pretty simple fellow, and found many completely beautiful things to paint.But the older you get the fewer completely beautiful things you see. Every flower has a brown spot somewhere, and a hippogriff has evil laughter. So at some point in his development an artist has to paint, not what he sees (which is what I've always done) but the beauty in what he sees. Most painters, I think, cross this line early; I'm crossing it late.("To Here and the Easel", 1954)”

“Why do you talk all the time?” I asked. It was a rhetorical question, but she cocked her head on one side and considered it carefully.“I think it’s ’cause I don’t know any big words, like you and Mummy,” she said, just in time to pull me out of my magazine again, “so I have to use lots and lots of little ones.”

“Once I had all the facts in, I found I didn't have the immoral courage to pull the caper. So I wrote it as a story. As a teenager, I didn't have any skills for writing as such, so it came out in 1500 words.”

“As far as hypnosis is concerned, I had a very serious problem when I was in my twenties. I encountered a man who later became the president of the American Society of Medical Hypnosis. He couldn't hypnotize me.”

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

“Writing is a communication.”

“Some major writers have a huge impact, like Ayn Rand, who to my mind is a lousy fiction writer because her writing has no compassion and virtually no humor. She has a philosophical and economical message that she is passing off as fiction, but it really isn't fiction at all.”

“We are now in a position to determine just what sort of science fiction story this really is.”

“Reality isn’t the most pleasant of atmospheres, Lieutenant. But we like to think we’re engineered for it. It’s a pretty fine piece of engineering, the kind an engineer can respect. Drag in an obsession and reality can’t tolerate it. Something has to give; if reality goes, your fine piece of engineering is left with nothing to operate on. Nothing it was designed to operate on. So it operates badly. So kick the obsession out; start functioning the way you were designed to function.”