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Home > Dictionary of Science Quotations > Scientist Names Index B > Claude Bernard Quotes > Belief

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Claude Bernard
(12 Jul 1813 - 10 Feb 1878)

French physiologist who helped establish the principles of experimentation in the life sciences. His Introduction to the Study of Experimental Medicine (1865) is a scientific classic.



Man is naturally metaphysical and arrogant, and is thus capable of believing that the ideal creations of his mind, which express his feelings, are identical with reality. From this it follows that the experimental method is not really natural to him.
— Claude Bernard
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Men who believe too firmly in their theories, do not believe enough in the theories of others. So … these despisers of their fellows … make experiments only to destroy a theory, instead of to seek the truth.
— Claude Bernard
From An Introduction to the Study of Experimental Medicine (1927, 1957), as translated by Henry Copley Greene (1957), 38. From the original French by Claude Bernard: “Ceux qui croient trop à leurs théories ne croient pas assez à celles des autres. Alors … ces contempteurs d'autrui … font des expériences que pour détruire une théorie, au lieu de les faire pour chercher la vérité.” (1865), 68. A Google translation gives: “Those who believe too much in their theories do not believe enough in those of others. So … these despisers of others … do experiments only to destroy a theory, instead of doing them to seek the truth.”
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Progress is achieved by exchanging our theories for new ones which go further than the old, until we find one based on a larger number of facts. … Theories are only 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
From An Introduction to the Study of Experimental Medicine (1865), as translated by Henry Copley Greene (1957), 165.
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We must keep our freedom of mind, … and must believe that in nature what is absurd, according to our theories, is not always impossible.
— Claude Bernard
In An Introduction to the Study of Experimental Medicine (1927, 1957), 38, as translated by Henry Copley Greene. From the original French by Claude Bernard: “Il faut garder sa liberté d'esprit, et croire que dans la nature l'absurde suivant nos théories n'est pas toujours impossible.” (1865), 67. A Google translation gives: “You have to keep your freedom of mind, … and believe that in nature the absurd according to our theories is not always impossible.”
Science quotes on:  |  Absurd (60)  |  According (236)  |  Belief (615)  |  Freedom (145)  |  Impossible (263)  |  Mind (1377)  |  Must (1525)  |  Nature (2017)  |  Theory (1015)

We must remain, in a word, in an intellectual disposition which seems paradoxical, but which, in my opinion, represents the true mind of the investigator. We must have a robust faith and yet not believe.
[Often seen summarized as: The investigator should have a robust faith—and yet not believe.]
— Claude Bernard
Introduction to the Study of Experimental Medicine (1865). In Alan S. Weber, Nineteenth Century Science: a Selection of Original Texts (2000), 333.
Science quotes on:  |  Belief (615)  |  Disposition (44)  |  Faith (209)  |  Intellectual (258)  |  Investigation (250)  |  Investigator (71)  |  Mind (1377)  |  Must (1525)  |  Opinion (291)  |  Remain (355)  |  Represent (157)  |  Research (753)  |  Word (650)


See also:
  • 12 Jul - short biography, births, deaths and events on date of Bernard's birth.
  • Claude Bernard - context of quote The alchemists founded chemistry - Medium image (500 x 350 px)
  • Claude Bernard - context of quote “The alchemists founded chemistry” - Large image (800 x 600 px)
  • Claude Bernard - context of quote The experimenter - Medium image (500 x 350 px)
  • Claude Bernard - context of quote The experimenter - Large image (800 x 600 px)
  • Claude Bernard - context of quote Make experiments to … control our ideas - Medium image (500 x 350 px)
  • Claude Bernard - context of quote Make experiments to … control our ideas - Large image (800 x 600 px)

Carl Sagan Thumbnail In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
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