Disapproval is a very important factor in all progress. There has really never been any progress without it.

By 3000 B.C. the art of Egypt was so ripe and so far advanced that it is surprising to find any student of early culture proposing that the crude contemporary art of the early Babylonians is the product of a civilization earlier than that of the Nile.

In any case, in so far as our knowledge of the universe carries us, the advent of civilization for the first time on our globe represents the highest ascent of the life processes to which evolution had anywhere attained.

I've always been interested in people, but I've never liked them.

We of America are especially fitted to visualize and to understand the marvellous transformation of a wilderness into a land of splendid cities.

It is the recognition of history as a record of human experience which has inevitably resulted in the inclusion of this conquest of civilization within the framework of a complete human history.