The Twilight Zone, "The Fugitive" (1962).
The Twilight Zone
Variant: Science fiction is the improbable made possible, and fantasy is the impossible made probable.
Context: It is said that science fiction and fantasy are two different things. Science fiction is the improbable made possible, and fantasy is the impossible made probable.
“I think that the best science fiction is where the story is fiction but the science is real, or at least as real as possible. If you’re going to write a good sci-fi, and you want me to believe the one wholly implausible idea that your story is about, then every other aspect of the film should be as seemingly reasonable as it possibly can be. That’s what Jurassic Park tried to do. If I am to believe that an impossibly huge reptilian monster is destroying the city, then the back story of it’s origin ought to sound realistic enough to counter-balance that. That’s what the first Godzilla movie tried to do. After that, filmmakers adopted the opposite strategy; so that everything else in the subsequent sequels had so many outrageous absurdities, each so insanely stupid, that the monster in the middle was the most reasonable element by comparison.”
Patheos, Weighing in on Godzilla http://www.patheos.com/blogs/reasonadvocates/2014/06/08/weighing-in-on-godzilla/ (June 8, 2014)
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Aron Ra 190
Aron Ra is an atheist activist and the host of the Ra-Men P… 1962Related quotes
Source: Iranian Students News Agency, 2004 http://www.isna.ir/news/8307-08004/%D9%85%D8%AF%D9%8A%D8%A7-%D9%83%D8%A7%D8%B4%D9%8A%DA%AF%D8%B1-%D9%82%D8%B1%D8%A7%D8%B1-%D8%A8%D8%B1-%D8%A7%D9%8A%D9%86-%D9%86%D9%8A%D8%B3%D8%AA-%D9%83%D9%87-%D8%AA%D9%88%D8%B3%D8%B7-%D9%86%D9%88%D9%8A%D8%B3%D9%86%D8%AF%DA%AF%D8%A7%D9%86-%D8%A7%D9%8A%D8%B1%D8%A7%D9%86%D9%8A-%D8%B4%D8%A7%D9%87%D9%83%D8%A7%D8%B1

The Rome Press Conference (23 July 2001)

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

“There is more to a science fiction story than the science it contains. There is also the story.”
Robot Dreams (1986), introduction
General sources

“All the stories are fictions. What matters is which fiction you believe.”
Source: Children of the Mind

“The story you are about to read is a work of fiction. Nothing - and everything - about it is real.”
Jack Arnold in The Horror People http://eric.b.olsen.tripod.com/arnold.html (1976)

"William Shtner on Sci-Fi, Aging and the Environment" http://www.saturdayeveningpost.com/2017/08/22/in-the-magazine/shatner.html as interviewed by Jeanne Wolf, Saturday Evening Post, September/October 2017

The Paris Review interview (2010)
Context: Science Fiction is the fiction of ideas. Ideas excite me, and as soon as I get excited, the adrenaline gets going and the next thing I know I’m borrowing energy from the ideas themselves. Science fiction is any idea that occurs in the head and doesn’t exist yet, but soon will, and will change everything for everybody, and nothing will ever be the same again. As soon as you have an idea that changes some small part of the world you are writing science fiction. It is always the art of the possible, never the impossible.