Under conditions of tyranny it is far easier to act than to think.

Ideologies - isms which to the satisfaction of their adherents can explain everything and every occurence by deducing it from a single premise - are a very recent phenomenon ... Not before Hitler and Stalin were the great political potentialities of the ideologies discovered.

One must think with the body and the soul or not think at all.

Our tradition of political thought had its definite beginning in the teachings of Plato and Aristotle. I believe it came to a no less definite end in the theories of Karl Marx.

Men who no longer can make sure of the reality which they feel and experience through talking about it and sharing it with their fellow-men, live in the same nightmare of loneliness and uncertainty which, in a normal world, is the terrible fate of insanity.

Caution in handling generally accepted opinions that claim to explain whole trends of history is especially important for the historian of modern times, because the last century has produced an abundance of ideologies that pretend to be keys to history but are actually nothing but desperate efforts to escape responsibility.

There always comes a point beyond which lying becomes counterproductive. This point is reached when the audience to which the lies are addressed is forced to disregard altogether the distinguishing line between truth and falsehood in order to be able to survive.