But it happens further quite naturally that men who believe too firmly in their theories, do not believe enough in the theories of others. So the dominant idea of these despisers of their fellows is to find others’ theories faulty and to try to contradict them. […] They make experiments only to destroy a theory, instead of to seek the truth. At the same time, they make poor observations, because they choose among the results of their experiments only what suits their object, neglecting whatever is unrelated to it, and carefully setting aside everything which might tend toward they idea they wish to combat.
[Mais il arrive encore tout naturellement que ceux qui croient trop à leurs théories ne croient pas assez à celles des autres. Alors l’idée dominante de ces contempteurs d’autrui est de trouver les théories des autres en défaut et de chercher à les contredire. […] Ils ne font des expériences que pour détruire une théorie, au lieu de les faire pour chercher la vérité. Ils font également de mauvaises observations, parce qu’ils ne prennent dans les résultats de leurs expériences que ce qui convient à leur but, en négligeant ce qui ne s’y rapporte pas, et en écartant bien soigneusement tout ce qui pourrait aller dans le sens de l’idée qu’ils veulent combattre.]
Claude Bernard (1813-1878) French physiologist, scientist
An Introduction to the Study of Experimental Medicine [Introduction à l’Étude de la Médecine Expérimentale], ch. 3 (1865) [tr. Greene (1957)]
(Source)
(Source (French)). Other translation:But it still happens quite naturally that those who believe too strongly in their own theories don't believe enough in those of others. The dominant idea of these detractors of others is to find flaws in other people's theories and to try to contradict them. [...] They conduct experiments only to disprove a theory, instead of doing so to seek the truth. They also make flawed observations because they only select from the results of their experiments what suits their purpose, neglecting what is irrelevant, and carefully disregarding anything that might support the idea they want to refute.
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Mistakes are, after all, the foundation of truth, and if a man does not know what a thing is, it is at least an increase in knowledge if he knows what it is not.
Carl Jung (1875-1961) Swiss psychologist
Aion: Researches into the Phenomenology of the Self, ch. 15 “Conclusion,” ¶ 429 (1959; 1968 ed.) [tr. Hull]
Final words.
It would never come into their [the masses’] heads to fabricate colossal untruths, and they would not believe that others could have the impudence to distort the truth so infamously. Even though the facts which prove this to be so may be brought clearly to their minds, they will still doubt and waver and will continue to think that there may be some other explanation. For the grossly impudent lie always leaves traces behind it, even after it has been nailed down, a fact which is known to all expert liars in this world and to all who conspire together in the art of lying.
Adolph Hitler (1889-1945) German leader
Mein Kampf [My Struggle], Vol. 1, ch. 10 (1925)
Details that could throw doubt on your interpretation must be given, if you know them. You must do the best you can — if you know anything at all wrong, or possibly wrong — to explain it. If you make a theory, for example, and advertise it, or put it out, then you must also put down all the facts that disagree with it, as well as those that agree with it. There is also a more subtle problem. When you have put a lot of ideas together to make an elaborate theory, you want to make sure, when explaining what it fits, that those things it fits are not just the things that gave you the idea for the theory; but that the finished theory makes something else come out right, in addition. In summary, the idea is to try to give all of the information to help others to judge the value of your contribution; not just the information that leads to judgment in one particular direction or another.
Richard Feynman (1918-1988) American physicist
“Cargo Cult Science,” commencement address, California Institute of Technology (1974)
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The capacity of a human mind to believe devoutly in what seems to me to be the highly improbable — from table tapping to the superiority of their own children — has never been plumbed. Faith strikes me as intellectual laziness, but I don’t argue with it — especially as I am rarely in a position to prove that it is mistaken.
Robert A. Heinlein (1907-1988) American writer
Stranger in a Strange Land, ch. 18 (1960 ed., publ. 1991)
(Source)
An elided version is found in the 1961 published edition, in ch. 13.
