Quotations about   theory

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When my information changes, I alter my conclusions. What do you do, sir?

John Maynard Keynes (1883-1946) English economist
(Attributed)

Reply to a criticism of having changed his position on monetary policy. Quoted in Paul Samuelson, "The Keynes Centenary" The Economist, Vol. 287 (1983), but possibly apocryphal (see here).
Added on 21-Mar-17 | Last updated 24-Mar-17
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No facts are to me sacred; none are profane; I simply experiment, an endless seeker, with no Past at my back.

Ralph Waldo Emerson (1803-1882) American essayist, lecturer, poet
“Circles,” Essays: First Series (1841)
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Added on 13-Feb-17 | Last updated 13-Feb-17
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As with the Christian religion, the worst advertisement for Socialism is its adherents.

orwell-worst-advertisement-for-socialism-wist_info-quote

George Orwell (1903-1950) English writer [pseud. of Eric Arthur Blair]
The Road to Wigan Pier, ch. 11 (1937)
Added on 30-Sep-16 | Last updated 30-Sep-16
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Was I to believe him in earnest in his intention to penetrate to the centre of this massive globe? Had I been listening to the mad speculations of a lunatic, or to the scientific conclusions of a lofty genius? Where did truth stop? Where did error begin?

Jules Verne (1828-1905) French novelist, poet, playwright
Journey to the Center of the Earth, ch. 7 “A Woman’s Courage” (1864) [tr. Malleson]
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Added on 1-Jul-16 | Last updated 1-Jul-16
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In fact, the mere act of opening the box will determine the state of the cat, although in this case there were three determinate states the cat could be in: these being Alive, Dead, and Bloody Furious.

Terry Pratchett (1948-2015) English author
Lords and Ladies (1992)
Added on 12-Aug-15 | Last updated 12-Aug-15
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Theories are only verified hypotheses, verified by more or less numerous facts. Those verified by the most facts are the best, but even then they are never final, never to be absolutely believed.

Claude Bernard (1813-1878) French physiologist, scientist
An Introduction to the Study of Experimental Medicine [Introduction à l’Étude de la Médecine Expérimentale] (1865)
Added on 23-Jan-15 | Last updated 23-Jan-15
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When we meet a fact which contradicts a prevailing theory, we must accept the fact and abandon the theory, even when the theory is supported by great names and generally accepted.

Claude Bernard (1813-1878) French physiologist, scientist
An Introduction to the Study of Experimental Medicine [Introduction à l’Étude de la Médecine Expérimentale] (1865)
Added on 16-Jan-15 | Last updated 16-Jan-15
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I suppose the process of acceptance will pass through the usual four stages:
1. This is worthless nonsense,
2. This is an interesting, but perverse, point of view,
3. This is true, but quite unimportant,
4. I always said so.

J.B.S. Haldane (1892-1964) English geneticist [John Burden Sanderson Haldane]
“The Truth About Death,” Journal of Genetics, Vol. 58, page 464 (1963)
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Review of The Chester Beatty Research Institute Serially Abridged Life Tables, England and Wales, 1841-1960. Referring to the stages a scientific theory goes through.
Added on 6-Oct-14 | Last updated 6-Oct-14
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I like the scientific spirit — the holding off, the being sure but not too sure, the willingness to surrender ideas when the evidence is against them: this is ultimately fine — it always keeps the way beyond open.

Walt Whitman (1819-1892) American poet
Remark to the author (4 May 1888), Horace Traubel, Walt Whitman’s Camden Conversations [ed. W. Teller (1973)]
Added on 12-Feb-14 | Last updated 12-Feb-14
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