You can't really predict the future. All you can do is invent it.

My old English buddy, John Rackham, wrote and told me what made science fiction different from all other kinds of literature - science fiction is written according to the science fiction method.

If you don't care about science enough to be interested in it on its own, you shouldn't try to write hard science fiction. You can write like Ray Bradbury and Harlan Ellison as much as you want.

A good science fiction story should be able to predict not the automobile but the traffic jam.

I'm pretty catholic about what constitutes science fiction.

You don't think progress goes in a straight line, do you? Do you recognize that it is an ascending, accelerating, maybe even exponential curve? It takes hell's own time to get started, but when it goes it goes like a bomb.

On this day I want to tell you about, which will be about a thousand years from now, there were a boy, a girl and a love story.