Animal language is a contagious expression of mood effecting communication between social partners.

The city is a cultural invention enforcing on the citizen knowledge of his own nature. And this we do not like. That we are aggressive beings, easily given to violence; that we get along together because we must more than because we want to, and that the brotherhood of man is about as far from reality today as it was two thousand years ago; that reason's realm is small; that we never have been and never shall be created equal; that if the human being is perfectible, he has so far exhibited few symptoms - all are considerations of man from which space tends to protect us.

But we were born of risen apes, not fallen angels, and the apes were armed killers besides. And so what shall we wonder at? Our murders and massacres and missiles, and our irreconcilable regiments? Or our treaties whatever they may be worth; our symphonies however seldom they may be played; our peaceful acres, however frequently they may be converted into battlefields; our dreams however rarely they may be accomplished. The miracle of man is not how far he has sunk but how magnificently he has risen. We are known among the stars by our poems, not our corpses.

Aggressiveness is the principal guarantor of survival.

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

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.

What truly leads the evolutionary procession, in other words, is behavior.