What could not be denied was that in vast segments of the animal world natural selection of the most qualified individuals took place not by competition for females but by competition for space.

Sex is a sideshow in the world of the animal, for the dominant color of that world is fear.

For the soundest of evolutionary reasons man appears at his best when times are worst.

Aggressiveness is the principal guarantor of survival.

We are born of risen apes, not fallen angels.

Natural selection deals ruthlessly with any population, bird or beaver, which fails to solve the problems of its environment with all those resources, learned or unlearned, which may be at its disposal.

Human war has been the most successful of our cultural traditions.