Individuals who could not form cooperative alliances, on average, died sooner and left fewer children. And so we are the descendants of the successful cooperators.

And it’s not just that ‘we all need somebody to lean on’; recent work on giving support shows that caring for others is often more beneficial than is receiving help. . . . We need the give and the take, we need to belong. An ideology of extreme personal freedom can be dangerous because it encourages people to leave homes, jobs, cities and marriages in search of personal and professional fulfillment, thereby breaking the relationships that were probably their best hope for such fulfillment.

Human rationality depends critically on sophisticated emotionality. It is only because our emotional brain works so well that our reasoning can work at all.

We scientists have way too much a tendency to simplify problems. I guess it actually comes to us naturally. Take the simplest unit, separate out all the confusing, external factors. Study it. Make sure you understand it. And in psychology that means the person studying the individual. But if you want to study our social nature, if you want to study processes that will lead to war and peace, you don't learn all that much by looking at the single individual. A lot of the important things are emergent facts about us, things that you can only see when you get a lot of us interacting.

Scandal is great entertainment because it allows people to feel contempt, a moral emotion that gives feelings of moral superiority while asking nothing in return. With contempt you don't need to right the wrong (as with anger) or flee the scene (as with fear or disgust). And the best of all, contempt is made to share. Stories about the moral failings of others are among the most common kinds of gossip, they are a stable of talk radio, and they offer a ready way for people to show that they share a common moral orientation.

Liberals tend to be much more concerned about business and corporations as the oppressors. They look to government as the solution. On the Right it's the opposite. They see business as good, as what generates wealth in society, and they see government as the oppressor, which makes it hard for especially small businesspeople.

Reciprocity is a deep instinct; it is the basic currency of social life.