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The stability of the internal medium is a primary condition for the freedom and independence of certain living bodies in relation to the environment surrounding them.
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Observation is a passive science, experimentation an active science.
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Science repulses the indefinite.
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All the vital mechanisms, varied as they are, have only one object, that of preserving constant the conditions of life in the internal environment.
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If I had to define life in a word, it would be: Life is creation.
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Theories are only verified hypotheses, verified by more or less numerous facts. Those verified by the most facts are the best, but even then they are never final, never to be absolutely believed.
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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.
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True science teaches us to doubt and to abstain from ignorance.
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Science increases our power in proportion as it lowers our pride.
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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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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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They make poor observations, because they choose among the results of their experiments only what suits their object, neglecting whatever is unrelated to it and carefully setting aside everything which might tend toward the idea they wish to combat.
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Indeed, proof that a given condition always precedes or accompanies a phenomenon does not warrant concluding with certainty that a given condition is the immediate cause of that phenomenon. It must still be established that when this condition is removed, the phenomen will no longer appear.
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A modern poet has characterized the personality of art and the impersonality of science as follows: Art is I: Science is We.