Men who are unhappy, like men who sleep badly, are always proud of the >>
The secret of happiness is this: let your interests be as wide as poss >>
The time you enjoy wasting is not wasted time. >>
Yet what are all such gaieties to me whose thoughts are full of indice >>
What would life be without arithmetic, but a scene of horrors? >>
Nobody before the Pythagorean had thought that mathematical relations >>
Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.