Guessing before proving! Need I remind you that it is so that all important discoveries have been made?

Sociology is the science with the greatest number of methods and the least results.

Intuition is more important to discovery than logic.

It is far better to foresee even without certainty than not to foresee at all.

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

If one looks at the different problems of the integral calculus which arise naturally when one wishes to go deep into the different parts of physics, it is impossible not to be struck by the analogies existing.

All that we can hope from these inspirations, which are the fruits of unconscious work, is to obtain points of departure for such calculations. As for the calculations themselves, they must be made in the second period of conscious work which follows the inspiration, and in which the results of the inspiration are verified and the consequences deduced.‎