Just as houses are made of stones, so is science made of facts.

Chance ... must be something more than the name we give to our ignorance.

If we ought not to fear mortal truth, still less should we dread scientific truth. In the first place it can not conflict with ethics? But if science is feared, it is above all because it can give no happiness? Man, then, can not be happy through science but today he can much less be happy without it.

But all of my efforts served only to make me better acquainted with the difficulty, which in itself was something.

Analyse data just so far as to obtain simplicity and no further.

It is with logic that one proves; it is with intuition that one invents.

All the scientist creates in a fact is the language in which he enunciates it. If he predicts a fact, he will employ this language, and for all those who can speak and understand it, his prediction is free from ambiguity. Moreover, this prediction once made, it evidently does not depend upon him whether it is fulfilled or not.