Claude Bernard
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"Claude Bernard" was a French physiologist. Historian I. Bernard Cohen of Harvard University called Bernard "one of the greatest of all men of science". Among many other accomplishments, he was one of the first to suggest the use of blind experiments to ensure the objectivity of scientific observations. He was the first to define the term milieu intérieur, now known as homeostasis.

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Put off your imagination, as you put off your overcoat, when you enter the laboratory. Put it on again, as you put on your overcoat, when you leave.

We can learn nothing except by going from the known to the unknown.

A fact in itself is nothing. It is valuable only for the idea attached to it, or for the proof which it furnishes.

The experimenter who does not know what he is looking for will not understand what he finds.

It is what we know already that often prevents us from learning.

Mediocre men often have the most acquired knowledge.

The true worth of an experimenter consists in his pursuing not only what he seeks in his experiment, but also what he did not seek.

Observation is a passive science, experimentation an active science.

Man can learn nothing unless he proceeds from the known to the unknown.

Art is I; science is we.

In teaching man, experimental science results in lessening his pride more and more by proving to him every day that primary causes, like the objective reality of things, will be hidden from him forever and that he can only know relations.