If two people stare at each other for more than a few seconds, it means they are about to either make love or fight. Something similar might be said about human societies. If two nearby societies are in contact for any length of time, they will either trade or fight. The first is non-zero-sum social integration, and the second ultimately brings it.

God knows greed won't vanish. Neither will hatred or chauvanism. Human nature is a stubborn thing. But it isn't beyond control. Even if our core impulses can;t be banished, they can be tempered and redirected.

Actually, there is a sense in which polygynous marriage has not been the historical norm - even where polygyny is permitted, multiple wives are generally reserved for a relatively few men who can afford them or qualify via formal rank. For eons and eons, most marriages have been monogamous, even though most societies haven't been

If war can indeed be turned into a relic, then the virtue of greed will recede further. From a given society's standpoint, one big upside of wanton material acquisition has traditionally been the way it drives technological progress-which, after all, helps keep societies strong. In the nineteenth century, Russia ans Germany had little choice about modernizing; in those days stasis invited conquest. But if societies no longer face conquest, breakneck technological advance is an offer they can refuse, and frugality a luxury people can afford.

Maybe the growth of "God" signifies the existence of God. That is: if history naturally pushes people toward moral improvement, toward moral growth, and their God, as they conceive their God, grows accordingly, becoming morally richer, then maybe this growth is evidence of some higher purpose, and maybe - conceivably - the source of that purpose is worthy of the name divinity.

...human beings are a species splendid in their array of moral equipment, tragic in their propensity to misuse it, and pathetic in their ignorance of the misuse.

Giving men marriage tips is a little like offering Vikings a free booklet titled How Not to Pillage.