Legalizing homosexuality is not the first step on a slippery slope to legalizing everything.

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.

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.

The final moment of success is often no more thrilling than taking off a heavy backpack at the end of a long hike. If you went on the hike only to feel that pleasure, you are a fool. Yet people sometimes do just this. They work hard at a task and expect some special euphoria at the end. But when they achieve success and find only moderate and short-lived pleasure, they ask is that all there is? They devalue their accomplishments as a striving after wind. We can call this the progress principle: Pleasure comes more from making progress toward goals than from achieving them.

Happiness requires changing yourself and changing your world. It requires pursuing your own goals and fitting in with others. Different people at different times in their lives will benefit from drawing more heavily on one approach or the other.

The extreme self-sacrifice characteristic of group-selected species such as ants and bees can often be found among soldiers.

Almost everything we do is automatic, yet we're not aware of that. We feel like there's a circle of light. We're like the drunk who lost his keys and is looking under the streetlight, and the cop says, "Where'd you lose your keys?" You say, "Back in the alley, but the light's so much better over here." The divided self refers to the fact that we are basically animals with animal brains. These animal brains run our lives. They're very good at it.