Man is by nature competitive, combative, ambitious, jealous, envious, and vengeful.

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

It is just because civilization is ever evolving, changing, and becoming more complicated, that experts find it so difficult to define it in explicit terms.

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

Religious leaders and men of science have the same ideals; they want to understand and explain the universe of which they are part; they both earnestly desire to solve, if a solution be ever possible, that great riddle: Why are we here?

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

There are very few men and women in whom a Universalist feeling is altogether lacking; its prevalence suggests that it must be part of our inborn nature and have a place in Nature's scheme of evolution.