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.

Once you understand the power of stimulus control, you can use it to your advantage by changing the stimuli in your environment and avoiding undesirable ones; or, if that's not possible, by filling your consciousness with thoughts about their less tempting aspects.

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.

Morality binds and blinds.

If I have a mission in life, it is to convince people that everyone is morally motivated - everyone except for psychopaths.

If you have a personality predisposed to liberalism, you might gravitate more to the artsy crowd or the anti-establishment crowd. And then those peers will affect you, and they will give you values, and you will copy them.

We can tolerate great diversity in our aesthetic beliefs, but we can't tolerate much diversity in our moral beliefs.