The mental never influences the physical. It is always the physical that modifies the mental, and when we think that the mind is diseased, it is always an illusion.
CLAUDE BERNARDFirst causes are outside the realm of science.
More Claude Bernard Quotes
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A discovery is generally an unforeseen relation not included in theory.
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We must never make experiments to confirm our ideas, but simply to control them.
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The goal of scientific physicians in their own science … is to reduce the indeterminate. Statistics therefore apply only to cases in which the cause of the facts observed is still indeterminate.
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The doubter is a true man of science: he doubts only himself and his interpretations, but he believes in science.
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Science rejects the indeterminate.
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Everything is poisonous, nothing is poisonous, it is all a matter of dose.
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We must remain, in a word, in an intellectual disposition which seems paradoxical, but which, in my opinion, represents the true mind of the investigator. We must have a robust faith and yet not believe.
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The great experimental principle, then, is doubt, that philosophic doubt which leaves to the mind its freedom and initiative, and from which the virtues most valuable to investigators in physiology and medicine are derived.
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Mediocre men often have the most acquired knowledge. It is in the darker. It is in the darker regions of science that great men are recognized; they are marked by ideas which light up phenomena hitherto obscure and carry science forward.
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A contemporary poet has characterized this sense of the personality of art and of the impersonality of science in these words,-‘Art is myself; science is ourselves. ‘
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The science of life is a superb and dazzlingly lighted hall which may be reached only by passing through a long and ghastly kitchen.
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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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The first requirement in using statistics is that the facts treated shall be reduced to comparable units.
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In science, the best precept is to alter and exchange our ideas as fast as science moves ahead.
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Science increases our power in proportion as it lowers our pride.
CLAUDE BERNARD






