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?

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

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

No tribe unites with another of its own free will.

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.

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.

The main force used in the evolving world of humanity has hitherto been applied in the form of war.