Your identity is like your shadow: not always visible and yet always present.

Do not confuse fantasy with imagination; the former consumes itself in daydreaming, the latter stimulates creativity in the arts and in the sciences.

Sometimes true tolerance requires an extraordinary strength, which we are often too weak to exercise.

It is certainly a good thing always to forgive with generosity, but it is no doubt just never to forget the wrongs received: they belong to the route that leads to inner maturity.

When you would suffocate or ignore dissent, remember how many times you dissented.

A secret remains a secret until you make someone promise never to reveal it.

As long as his strength permits, the poor mortal must always climb new mountains.