For the most part, people use "empathy" to mean everything good. For instance, many medical schools have courses in empathy. But if you look at what they mean, they just want medical students to be nicer to their patients, to listen to them, to respect them, to understand them. What's not to like? If they were really teaching empathy, then I'd say there is a world of problems there.

Traditionally, psychology has been the study of two populations: university freshmen and white rats.

Something as important and central and encompassing as empathy can't be all bad. I think empathy plays a role in intimate relationships, where you might want your partner not just to care about you or understand you but to feel what you feel.

I think empathy can serve as a moral spark, motivating us to do good things. But anything can be a moral spark.

Empathy zooms you in on an individual and, as a result, it's narrow, it's innumerate, it's racist, it's very biased.

I think there's some evidence that when it comes to being a doctor or nurse, a police officer or therapist, that empathetic engagement leads to burn-out. Imagine if you're dealing with severely ill children, and you felt their pain all the time, and the pain of their parents - you wouldn't be able to do that job for very long. It would kill you.

Over the last few years, I've been focusing on questions having to do with the self, and questions having to do with morality. I'm very interested in why we do good things, or bad things, and where moral judgments come from.