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.

I think the greatest work in social psychology from the 1950s and '60s is enormously important. I wish every high school kid could take a course in social psychology. I think we're making enormous strides in understanding the brain. These aren't yet giving us great insights, but I feel like we're on the verge of it. In five or ten years this basically searching the brain is really going to change things.

There are a couple of watersheds in human evolution. Most people are comfortable thinking about tool use and language use as watersheds. But the ability to play non-zero-sum games was another watershed.

I'll suggest that the happiness hypothesis offered by Buddha and the Stoics should be amended: Happiness comes from within, and happiness comes from without. We need the guidance of both ancient wisdom and modern science to get the balance right.

The president is the high priest of what sociologist Robert Bellah calls the 'American civil religion.' The president must invoke the name of God (though not Jesus), glorify America's heroes and history,quote its sacred texts (the Declaration of Independence and the Constitution), and perform the transubstantiation of pluribus unum.

I think of myself as a social scientist. In order to get hired and to get promoted, we're forced to declare a disciplinary and sub-disciplinary specialty, so I am a psychologist and I am a social psychologist within that. But I think the exciting thing is to think about the social sciences in general and the nature of society. It's one of the hardest things to think about, because our brains aren't designed to think about these emergent entities. We're not good at it.

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