"It is what we know already that often prevents us from learning."
"Well-observed facts, though brought to light by passing theories, will never die; they are the material on which alone the house of science will at last be built."
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Source: Claude Bernard (2012). “An Introduction to the Study of Experimental Medicine”, p.186, Courier Corporation
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"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."
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