When he to whom one speaks does not understand, and he who speaks himself does not understand, that is Metaphysics.

Clever tyrants are never punished.

Liberty of thought is the life of the soul.

No opinion is worth burning your neighbor for.

Pleasantry is never good on serious points, because it always regards subjects in that point of view in which it is not the purpose to consider them.

Why are the Jews hated? It is the inevitable result of their laws; they either have to conquer everybody or be hated by the whole human race.

Wherever my travels may lead, paradise is where I am.