Experiment is the sole source of truth. It alone can teach us something new; it alone can give us certainty.

To invent is to discern, to choose.

Doubting everything and believing everything are two equally convenient solutions that guard us from having to think

What is it indeed that gives us the feeling of elegance in a solution, in a demonstration?

The aim of science is not things themselves, as the dogmatists in their simplicity imagine, but the relation between things.

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.‎

It is not order only, but unexpected order, that has value.