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.

the right to marry whoever one wishes is an elementary human right ... Even political rights, like the right to vote, and nearly all other rights enumerated in the Constitution, are secondary to the inalienable human rights to 'life, liberty and the pursuit of happiness' proclaimed in the Declaration of Independence; and to this category the right to home and marriage unquestionably belongs.

Education is the point at which we decide whether we love the world enough to assume responsibility for it and by the same token save it from that ruin which, except for renewal, except for the coming of the new and young, would be inevitable.

Violence is an expression of impotence.

There are no dangerous thoughts; thinking itself is dangerous.

The defiance of established authority, religious and secular, social and political, as a world-wide phenomenon may well one day be accounted the outstanding event of the last decade.

Forgiveness is the key to action and freedom.