Civilization never recedes; the law of necessity ever forces it onwards.
I am very bad at expressing tender sentiments. The very word 'love' frightens me.
Science, my lad, is made up of mistakes, but they are mistakes which it is useful to make, because they lead little by little to the truth.
If there were no thunder, men would have little fear of lightning.
Reality provides us with facts so romantic that imagination itself could add nothing to them.
Aures habent et non audient` - `They have ears but hear not