"It is what we know already that often prevents us from learning."
"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."
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Source: Claude Bernard (2012). “An Introduction to the Study of Experimental Medicine”, p.67, 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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