It is what we know already that often prevents us from learning.
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.
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.
We achieve more than we know. We know more than we understand. We understand more than we can explain.
Man can learn nothing unless he proceeds from the known to the unknown.
All the vital mechanisms, varied as they are, have only one object, that of preserving constant the conditions of life in the internal environment.
Those who do not know the torment of the unknown cannot have the joy of discovery.
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.
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.
Feeling alone guides the mind.
Mediocre men often have the most acquired knowledge
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.
The minds that rise and become really great are never self-satisfied, but still continue to strive.
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.
True science teaches us to doubt and, in ignorance, to refrain.
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.
Science increases our power in proportion as it lowers our pride.
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.
Science does not permit exceptions.
We must keep our freedom of mind, ... and must believe that in nature what is absurd, according to our theories, is not always impossible.
The doubter is a true man of science: he doubts only himself and his interpretations, but he believes in science.
A discovery is generally an unforeseen relation not included in theory.
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