In every man there is an instinctive and passionate reaction if his person or liberty is attacked.

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

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

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

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

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

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