A great surgeon performs operations for stone by a single method; later he makes a statistical summary of deaths and recoveries, and he concludes fro… - Claude Bernard

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A great surgeon performs operations for stone by a single method; later he makes a statistical summary of deaths and recoveries, and he concludes from these statistics that the mortality law for this operation is two out of five. Well, I say that this ratio means literally nothing scientifically and gives us no certainty in performing the next operation; for we do not know whether the next case will be among the recoveries or the deaths. What really should be done, instead of gathering facts empirically, is to study them more accurately, each in its special determinism. We must study cases of death with great care and try to discover in them the cause of mortal accidents so as to master the cause and avoid the accidents.

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About Claude Bernard

Claude Bernard (July 12, 1813 – February 10, 1878) was a French physiologist.

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Additional quotes by Claude Bernard

[I]t is important to determine at what point to apply doubt, so as to distinguish it from scepticism, and to show how scientific doubt becomes an element of the greatest certainty. The sceptic disbelieves in science and believes in himself; he believes enough in himself to dare deny science and to assert that it is not subject to definite, fixed laws. The doubter is a true man of science; he doubts only himself and his interpretations, but he believes in science; in the experimental sciences, he even accepts a criterion of absolute scientific principle.

[T]he experimental method draws from within itself an impersonal authority which dominates science. It forces this authority even on great men.[…] Every period has its own sum total of errors and of truths. Certain mistakes are, in a sense, inherent in their period, so that only the subsequent progress of science can reveal them.… [T]he further science advances, the more it takes an impersonal form and detaches itself from the past.

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