Courage is indispensible because in politics not life but the world is at stake.

The strength of even the strongest individual can always be overpowered by the many, who often will combine for no other purpose than to ruin strength precisely because of its peculiar independence.

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.

The chief reason warfare is still with us is neither a secret death-wish of the human species, nor an irrepressible instinct of aggression, nor, finally and more plausibly, the serious economic and social dangers inherent in disarmament, but the simple fact that no substitute for this final arbiter in international affairs has yet appeared on the political scene.

The concentration camps, by making death itself anonymous (making it impossible to find out whether a prisoner is dead or alive), robbed death of its meaning as the end of a fulfilled life. In a sense they took away the individual’s own death, proving that henceforth nothing belonged to him and he belonged to no one. His death merely set a seal on the fact that he had never existed.

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.

Thinking does not lead to truth; truth is the beginning of thought.