Arthur Clarke says that I am first in science and second in science fiction in accordance with an agreement we have made. I say he is first in science fiction and second in science.

And [Asimov]'ll sign anything, hardbacks, softbacks, other people's books, scraps of paper. Inevitably someone handed him a blank check on the occasion when I was there, and he signed that without as much as a waver to his smile — except that he signed: 'Harlan Ellison.

Creationists make it sound as though a 'theory' is something you dreamt up after being drunk all night.

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

The whole world might know you and acclaim you, but someone in the past, forever unreachable, forever unknowing, spoils it all.

In life, people will take you at your own reckoning.

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