It is what we know already that often prevents us from learning.
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.
The experimenter who does not know what he is looking for will not understand what he finds.
The terrain is everything; the germ is nothing.
Man can learn nothing unless he proceeds from the known to the unknown.
We achieve more than we know. We know more than we understand. We understand more than we can explain.
Mediocre men often have the most acquired knowledge
Tout est poison, rien n'est poison, tout est une question de dose. Everything is poisonous, nothing is poisonous, it is all a matter of dose.
Those who do not know the torment of the unknown cannot have the joy of discovery.
All the vital mechanisms, varied as they are, have only one object, that of preserving constant the conditions of life in the internal environment.
Men who have excessive faith in their theories or ideas are not only ill prepared for making discoveries; they also make very poor observations. Of necessity, they observe with a preconceived idea, and when they devise an experiment, they can see, in its results,only a confirmation of their theory. In this way they distort observation and often neglect very important facts because they do not further their aim.
True science teaches us to doubt and, in ignorance, to refrain.
Feeling alone guides the mind.
The minds that rise and become really great are never self-satisfied, but still continue to strive.
Art is 'I'; science is 'we'.
A fact in itself is nothing. It is valuable only for the idea attached to it, or for the proof which it furnishes.
It has often been said that, to make discoveries, one must be ignorant. This opinion, mistaken in itself, nevertheless conceals a truth. It means that it is better to know nothing than to keep in mind fixed ideas based on theories whose confirmation we constantly seek, neglecting meanwhile everything that fails to agree with them.
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.
Science does not permit exceptions.
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.
We must keep our freedom of mind, ... and must believe that in nature what is absurd, according to our theories, is not always impossible.
Progress is achieved by exchanging our theories for new ones which go further than the old, until we find one based on a larger number of facts. ... Theories are only 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.
Descriptive anatomy is to physiology what geography is to history, and just as it is not enough to know the typography of a country to understand its history, so also it is not enough to know the anatomy of organs to understand their functions.
We must alter theory to adapt it to nature, but not nature to adapt it to theory.
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.
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