The most dangerous of devotions, in my opinion, is the one endemic to Christianity: I was not born to be of this world. With a second life waiting, suffering can be endured- especially in other people. The natural environment can be used up. Enemies of the faith can be savaged and suicidal martyrdom praised.

True character arises from a deeper well than religion. It is the internalization of moral principles of a society, augmented by those tenets personally chosen by the individual, strong enough to endure through trials of solitude and adversity. The principles are fitted together into what we call integrity, literally the integrated self, wherein personal decisions feel good and true. Character is in turn the enduring source of virtue. It stands by itself and excites admiration in others. It is not obedience to authority, and while it is often consistent with and reinforced by religious belief, it is not piety.

If we were to vanish today, the land environment would return to the fertile balance that existed before the human population explosion. Only a dozen or so species, among which are the crab louse and a mite that lives in the oil glands of our foreheads, depend on us entirely. But if ants were to disappear, tens of thousands of other plant and animal species would perish also, simplifying and weakening land ecosystems almost everywhere.

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Animals use aggression as a technique for gaining control over necessities... that are scarce or are likely to become so... They intensify their threats and attack with increasing frequency as the population around them grow. As a result the behavior itself induces members of the population to spread out in space, raises the death rate, and lowers the birth rate. In such cases aggression is said to be a "density-dependent factor" in controlling population growth.

Pure knowledge is the ultimate emancipator. It equalizes people and sovereign states, erodes the archaic barriers of superstition and promises to lift the trajectory of cultural evolution. But I do not believe that it can change the ground rules of human behavior or alter the main course of history's predictable trajectory.

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Ancient Mexico, like most forest-invested New World tropics, was deficient in the kind of large game that flourished on the plains of Africa and Asia. ...The situation was partially relieved by cannibalizing the victims of human sacrifice. ...The [ Aztec ] priesthood... sanctified it... immediately after their hearts had been cut out, the victims were systematically butchered like animals and their parts distributed and eaten.

Early human beings... filled a special ecological niche: they were carnivorous primates of the African plains. ...When agriculture permitted the increase of population density, game was no longer abundant... carnivorism remained a basic dietary impulse, with cultural aftereffects that varied according to the special conditions of the environment in which the society evolved.