Not reading a beautiful book again because you've already read it, that is, as if you were not visiting a dear friend again because you know him already.

When two good men contend about principles, both are always right.

Generosity, to be perfect, should always be accompanied by a dash of humor.

Even a stopped clock is right twice every day. After some years, it can boast of a long series of successes.

The simplest and most familiar truth seems new and wonderful the instant we ourselves experience it for the first time.

Oh happy pessimists! What a joy it is to them to be able to prove again and again that there is no joy.

When curiosity turns to serious matters, it's called research.