Experiment is the sole source of truth. It alone can teach us something new; it alone can give us certainty.
We also know how cruel the truth often is, and we wonder whether delusion is not more consoling.
It is by logic we prove. It is by intuition we discover.
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.
Geometry is not true, it is advantageous.
