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.

To accept reason is impossible if you don't already possess it.

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

Who doesn't know anything, has to believe everything.

Never expect women to be sincere, so long as they are educated to think that their first aim in life is to please.

If you have one good idea, people will lend you twenty.

There are times when to be reasonable is to be cowardly.