The intellectual power, honesty, lucidity, courage, and disinterested love of the truth of the most gifted thinkers of the eighteenth century remain to this day without parallel. Their age is one of the best and most hopeful episodes in the life of mankind.

Only barbarians are not curious about where they come from, how they came to be where they are, where they appear to be going, whether they wish to go there, and if so, why, and if not, why not.

The notion of the perfect whole, the ultimate solution in which all good things coexist, seems to me not merely unobtainable--that is a truism--but conceptually incoherent. ......Some among the great goods cannot live together. That is a conceptual truth. We are doomed to choose, and every choice may entail an irreparable loss.

When one is engaged in a desperate defense of one's world and its values, nothing can be given away, any breach in the walls might be fatal, every point must be defended to the death.

The first people totalitarians destroy or silence are men of ideas and free minds.

Liberty is liberty, not equality or fairness or justice or human happiness or a quiet conscience.

Liberty and equality, spontaneity and security, happiness and knowledge, mercy and justice - all these are ultimate human values, sought for themselves alone; yet when they are incompatible, they cannot all be attained, choices must be made, sometimes tragic losses accepted in the pursuit of some preferred ultimate end.