The development of family entities enables men to cooperate far more effectively. Instead of constantly competing for the women with other men, each man essentially has a partner assigned to him, one with whom he can establish a family.

We would much rather blame nature for what we don't like in ourselves than credit it for what we do like.

Religion may have become a codification of morality, and it may fortify it, but it's not the origin of it.

People want to work with somebody who feels shame, who worries about the perceptions of others. Dishonesty is something we don't like in others.

We are by far the most contradictory of all primates. An animal with this much internal conflict has never lived on this earth.

We are territorial, power-hungry and even more brutal than chimpanzees.

You should know as much as you can about the human species if you have a hand in designing human society. Of course, I'm not saying that you can derive moral rules from nature - that's deriving an ought from an is, as the philosophers say - but you do need to know what kind of animals we are if you want to design a stable society.