“By and large, the kind of science fiction which makes tomorrow's headlines as near as this morning's coffee has enlarged popular awareness of the modern, miraculous world of science we live in. It has helped generations of young people feel at age with a changing world.But fashions change, old loves return, and now that Sputniks clutter up the sky with new and unfamiliar moons, the readers of science fiction are willing to wait to read tomorrow's headlines. Once again, I think, there is a place, a wish, a need for the wonder and color of the world way out. The world beyond the stars. The world we won't live to see. That is why I wrote The Door Through Space.”

“Most science fiction seemed to be written for people who already liked science fiction; I wanted to write stories for anyone, anywhere, living at any time in the history of the world.”

“But now science is the belief system that is hundreds of years old. And, like the medieval system before it, science is starting not to fit the world any more. Science has attained so much power that its practical limits begin to be apparent. Largely through science, billions of us live in one small world, densely packed and intercommunicating. But science cannot help us decide what to do with that world, or how to live. Science can make a nuclear reactor, but it cannot tell us not to build it. Science can make pesticide, but cannot tell us not to use it. And our world starts to seem polluted in fundamental ways---air, and water, and land---because of ungovernable science.”

“Sometimes people say that we're living in the future, and time's up for science fiction, but I think that never will be, because science fiction really isn't about the future. It's about change and present-day concerns”

“That's really what SF is all about, you know: the big reality that pervades the real world we live in: the reality of change. Science fiction is the very literature of change. In fact, it is the only such literature we have.”

“I think fantasy is best described as a kind of fiction that evokes wonder, mystery or magic, a sense of possibility beyond the ordinary world in which we live, and yet which reflects and comments upon that known world.”