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

Good men, whether they be Christians or rationalists, do not desire to discriminate between races, but the distinctions implanted by Nature are too conspicuous to escape the observation of our senses.

Before the discovery of agriculture mankind was everywhere so divided, the size of each group being determined by the natural fertility of its locality.

In a tribal organization, even in time of peace, service to tribe or state predominates over all self seeking; in war, service for the tribe or state becomes supreme, and personal liberty is suspended.

Christianity has not conquered nationalism; the opposite has been the case nationalism has made Christianity its footstool.

My personal conviction is that science is concerned wholly with truth, not with ethics.

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