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.

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

I am a rank individualist.

The German Fuhrer, as I have consistently maintained, is an evolutionist; he has consistently sought to make the practices of Germany conform to the theory of evolution.

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?

As long as man remains an inquiring animal, there can never be a complete unanimity in our fundamental beliefs. The more diverse our paths, the greater is likely to be the divergence of beliefs.