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

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?

A drunkard is one thing, and a temperate man is quite another.

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

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.