Disagreement produces debate but dissent produces dissension. Dissent (which come from the Latin, dis and sentire) means originally to feel apart from others. People who disagree have an argument, but people who dissent have a quarrel. People may disagree and both may count themselves in the majority. But a person who dissents is by definition in a minority. A liberal society thrives on disagreement but is killed by dissension. Disagreement is the life blood of democracy, dissension is its cancer.

The most important lesson of American history is the promise of the unexpected. None of our ancestors would have imagined settling way over here on this unknown continent. So we must continue to have society that is hospitable to the unexpected, which allows possibilities to develop beyond our own imaginings.

When I was living in England I found that the more I lived abroad, the more American I discovered I was.

Probably no one of us has the True Religion. But all of us together - if we are allowed to be free - are discovering ways of conversing about the great mysteries. The pretense to know all the answers to the deepest mysteries is, of course, the grossest fraud. And any people who declare a Jihad, a holy war on unbelievers - those who do not share their believers' pretended omniscience - are enemies of thinking men and woman and of civilization. I see religion as only a way of asking unanswerable questions, of sharing the joy of a community of quest, and solacing one another in our ignorance.

The most promising words ever written on the maps of human knowledge are terra incognita, unknown territory.

The most refined skills of color printing, the intricate techniques of wide-angle photography, provide us pictures of trivia bigger and more real than life. We forget that we see trivia and notice only that the reproduction is so good. Man fulfils his dream and by photographic magic produces a precise image of the Grand Canyon. The result is not that he adores nature or beauty the more. Instead he adores his camera - and himself.

Our attitude toward our own culture has recently been characterized by two qualities, braggadocio and petulance. Braggadocio - empty boasting of American power, American virtue, American know-how - has dominated our foreign relations now for some decades. Here at home - within the family, so to speak - our attitude to our culture expresses a superficially different spirit, the spirit of petulance. Never before, perhaps, has a culture been so fragmented into groups, each full of its own virtue, each annoyed and irritated at the others.