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.

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

Freedom means the opportunity to be what we never thought we would be.

Human models are more vivid and more persuasive than explicit moral commands.

Knowledge is not simply another commodity. On the contrary. Knowledge is never used up. It increases by diffusion and grows by dispersion.

We need not be theologians to see that we have shifted responsibility for making the world interesting from God to the newspaperman.