"It is what we know already that often prevents us from learning."
"Man can learn nothing unless he proceeds from the known to the unknown."
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Source: Bulletin of New York Academy of Medicine, Volume IV, 1928.
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More quotes by Claude Bernard
"The experimenter who does not know what he is looking for will not understand what he finds."
"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."
"The terrain is everything; the germ is nothing."
"Men who have excessive faith in their theories or ideas are not only ill prepared for making discoveries; they also make very poor observations. Of necessity, they observe with a preconceived idea, and when they devise an experiment, they can see, in its results,only a confirmation of their theory. In this way they distort observation and often neglect very important facts because they do not further their aim."
"Art is 'I'; science is 'we'."