"It is what we know already that often prevents us from learning."
"When a physician is called to a patient, he should decide on the diagnosis, then the prognosis, and then the treatment. ... Physicians must know the evolution of the disease, its duration and gravity in order to predict its course and outcome. Here statistics intervene to guide physicians, by teaching them the proportion of mortal cases, and if observation has also shown that the successful and unsuccessful cases can be recognized by certain signs, then the prognosis is more certain."
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Source: Claude Bernard (2012). “An Introduction to the Study of Experimental Medicine”, p.231, Courier Corporation
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"The experimenter who does not know what he is looking for will not understand what he finds."
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