“Science fiction … means what we point to when we say it.”
[In Search of Wonder: Essays on Modern Science Fiction, 1956, Advent Publishers, page 1, ISBN 0911682074]
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Damon Knight 9
American science fiction writer, editor and critic 1922–2002Related quotes

"How To Build A Universe That Doesn't Fall Apart Two Days Later" (1978)

“What do we mean when we say that first of all we seek liberty?”
“The Spirit of Liberty” - speech at “I Am an American Day” ceremony, Central Park, New York City (21 May 1944).
Extra-judicial writings
Context: What do we mean when we say that first of all we seek liberty? I often wonder whether we do not rest our hopes too much upon constitutions, upon laws and upon courts. These are false hopes; believe me, these are false hopes. Liberty lies in the hearts of men and women; when it dies there, no constitution, no law, no court can save it; no constitution, no law, no court can even do much to help it… What is this liberty that must lie in the hearts of men and women? It is not the ruthless, the unbridled will; it is not the freedom to do as one likes. That is the denial of liberty and leads straight to its overthrow. A society in which men recognize no check on their freedom soon becomes a society where freedom is the possession of only a savage few — as we have learned to our sorrow.
What then is the spirit of liberty? I cannot define it; I can only tell you my own faith. The spirit of liberty is the spirit which is not too sure that it is right; the spirit of liberty is the spirit which seeks to understand the minds of other men and women; the spirit of liberty is the spirit which weighs their interests alongside its own without bias; the spirit of liberty remembers that not even a sparrow falls to earth unheeded; the spirit of liberty is the spirit of Him who, near two thousand years ago, taught mankind that lesson it has never learned, but has never quite forgotten; that there may be a kingdom where the least shall be heard and considered side by side with the greatest.

Nobel Lecture (2010)

Boston Book Review interview by Harvey Blume http://www.dorislessing.org/boston.html (February 1998)

"Men on other planets", essay in The Craft of Science Fiction, (1976), edited by Reginald Bretnor
General sources
“Science is what we do when we don't know what we're doing.”
Alvaro De Rujula, quoted in "Large Hadron Collider - The Search For The Higgs" http://www.youtube.com/watch?v=_XbKZwXK-3c; this quote can be heard at approximately 3:55 to 4:15 in the video. It is important to note, it could be taken out of context. It implies that science is what we use when we do not know the answer to something.

A Conversation With Neal Stephenson http://www.sfsite.com/10b/ns67.htm