The discovery of agriculture was the first big step toward a civilized life.

The course of human history is determined, not by what happens in the skies, but what takes place in our hearts.

There are the further difficulties of building a population out of a diversity of races, each at a different stage of cultural evolution, some in need of restraint, many in need of protection; everywhere a bewildering Babel of tongues.

Reason has not tamed desire: it is as strong as ever.

I am a rank individualist.

Evolution is unproved and unprovable. We believe it only because the only alternative is special creation, and that is unthinkable.

Human nature, as manifested in tribalism and nationalism, provides the momentum of the machinery of human evolution.