“In science by a fiction as remarkable as any to be found in law, what once been published even though it be in the Russian language, is spoken of as known, and it is too often forgotten that the rediscovery in the library may be a more difficult and uncertain process than the first discovery in the laboratory.”
Lord Rayleigh (1884) as cited in: Brian Vickery (1958) Classification and indexing in science. Preface
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John Strutt, 3rd Baron Rayleigh 5
English physicist 1842–1919Related quotes
“First-rate science fiction was, and remains, more interesting than second-rate art.”
Ibid.
Essays and reviews, From the Land of Shadows (1982)

Source: Realistic models in probability (1968), p. 1

“The most remarkable discovery made by scientists is science itself.”
Source: The Creative Process, 1958, p. 97 Partly cited in: Daniel C. Schlenof. " 50 Years Ago: Greatest Scientific Discovery is Science Itself http://www.scientificamerican.com/article/50-100-150-scientific-creativity/," in Scientific American, Aug. 18, 2008.
Context: The most remarkable discovery made by scientists is science itself. The discovery must be compared in importance with the invention of cave-painting and of writing. Like these earlier human creations, science is an attempt to control our surroundings by entering into them and understanding them from inside. And like them, science has surely made a critical step in human development which cannot be reversed. We cannot conceive a future society without science. I have used three words to describe these far - reaching changes : discovery, invention and creation. There are contexts in which one of these words is more appropriate than the others.

“There is more to a science fiction story than the science it contains. There is also the story.”
Robot Dreams (1986), introduction
General sources
On Seeing Plays (1990).
Context: It is mankind's discovery of language which more than any other single thing has separated him from the animal creation. Without language, what concept have we of past or future as separated from the immediate present? Without language, how can we tell anyone what we feel, or what we think? It might be said that until he developed language, man had no soul, for without language how could he reach deep inside himself and discover the truths that are hidden there, or find out what emotions he shared, or did not share, with his fellow men and women. But because this greatest gift of all gifts is in daily use, and is smeared, and battered and trivialized by commonplace associations, we too often forget the splendour of which it is capable, and the pleasures that it can give, from the pen of a master.