Economic issues are just as much moral issues as social issues.

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.

It only takes twenty generations of selective breeding to create large differences or appearance and behavior in other mammals.

Trying to run Congress without human relationships is like trying to run a car without motor oil. Should we be surprised when the whole thing freezes up?

In college, I was dead set on being a philosophy major, because I wanted to figure out the meaning of life. Four years later I realized philosophy had really nothing to say about the meaning of life, and psychology and literature are really where it's at.

The psychological origins of love are in attachment to parents and sexual partners. We do not attach to ourselves; we do not seek security and fulfillment in ourselves.

Most of our social nature is like that of other primates - we're mostly out for ourselves.