[T]he different branches of Arithmetic - Ambition [G]eometry is not true, it is advantageous.

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.

When the physicists ask us for the solution of a problem, it is not drudgery that they impose on us, on the contrary, it is us who owe them thanks.

If we knew exactly the laws of nature and the situation of the universe at the initial moment, we could predict exactly the situation of the same universe at a succeeding moment.

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

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

If nature were not beautiful, it would not be worth knowing, and if nature were not worth knowing, life would not be worth living