The traveler used to go about the world to encounter the natives. A function of travel agencies now is to prevent this encounter.

Disagreement produces debate but dissent produces dissension.

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

History had been man's effort to accomodate himself to what he could not do. Amereican history in the 20th century would, more than ever before, test man's ability to accomodate himself to all the new things he could do.

America has been a land of dreams. A land where the aspirations of people from countries cluttered with rich, cumbersome, aristocratic, ideological pasts can reach for what once seemed unattainable. Here they have tried to make dreams come true. Yet now... we are threatened by a new and particularly American menace. It is not the menace of class war, of ideology, of poverty, of disease, of illiteracy, or demagoguery, or of tyranny, though these now plague most of the world. It is the menace of unreality.

Creators, makers of the new, can never become obsolete, for in the arts there is no correct answer. The story of discoverers could be told in simple chronological order, since the latest science replaces what went before. But the arts are another story- a story of infinite addition. We must find order in the random flexings of the imagination.

The American experience stirred mankind from discovery to exploration. From the cautious quest for what they knew (or thought they knew) was out there, into an enthusiastic reaching to the unknown. These are two substantially different kinds of human enterprise.