[Social] science fiction is that branch of literature which is concerned with the impact of scientific advance on human beings.

... you just can't differentiate between a robot and the very best of humans.

I do not use airplanes. They strike me as unsporting. You can have an automobile accident-and survive. You can be on a sinking ship-and survive. You can be in an earthquake, fire, volcanic eruption, tornado, what you will-and survive. But if your plane crashes, you do not survive. And I say the heck with it.

I don't expect to live forever, nor do I repine over that, but I am weak enough to want to be remembered forever. - Yet how few of those who have lived, even of those who have accomplished far more than I have, linger on in world memory for even a single century after death

Happiness is doing it rotten your own way.

We are reaching the stage where the problems we must solve are going to become insoluble without computers. I do not fear computers, I fear the lack of them.

I have never, in all my life, not for one moment, been tempted toward religion of any kind. The fact is that I feel no spiritual void. I have my philosophy of life, which does not include any aspect of the supernatural and which I find totally satisfying. I am, in short, a rationalist and believe only that which reason tells me is so.