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

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

Secret thoughts are only half free: they fly undisturbed in the skies of the inner freedom, but they can never leave them.

Inner freedom demands the rejection of any imposition that injures our dignity.

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

Your will cannot always choose the path; very often the route is determined by chance or by the will of others.

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