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

I prize the conditions under which I have lived because they have permitted me to choose my opportunities, to inquire into such matters as interested me, and to publish what I believed to be true, uncontrolled by any central authority.

We shall never understand the ethical system taught by Jesus unless we realize that he was a Jew, not only by birth, but that he lived and taught as a Jew; the Sermon on the Mount was addressed to his distracted fellow nationals.

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.

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

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

This world of ours has been constructed like a superbly written novel: we pursue the tale with avidity, hoping to discover the plot.