The crucial differences which distinguish human societies and human beings are not biological. They are cultural.

Western civilization, because of fortuitous historical circumstances, has spread itself more widely than any other local group that has so far been known.

The trouble is not that we are never happy-it is that happiness is so episodical.

Success and failure in our own national economy will hang upon the degree to which we are able to work with races and nations whose social order and whose behavior and attitudes are strange to us.

I gambled on having the strength to live two lives, one for myself and one for the world.

The trouble with life isn't that there is no answer, it's that there are so many answers.

In world history, those who have helped to build the same culture are not necessarily of one race, and those of the same race have not all participated in one culture.