“There’s the claim that the only progress made is in posing problems that scientists can answer. That philosophy never has the means to answer problems—it’s just biding its time till the scientists arrive on the scene. You hear this quite often. There is, among some scientists, a real anti-philosophical bias. The sense that philosophy will eventually disappear. But there’s a lot of philosophical progress, it’s just a progress that’s very hard to see. It’s very hard to see because we see with it. We incorporate philosophical progress into our own way of viewing the world. [...] And it’s usually philosophical arguments that first introduce the very outlandish idea that we need to extend rights. And it takes more, it takes a movement, and activism, and emotions, to affect real social change. It starts with an argument, but then it becomes obvious. The tracks of philosophy’s work are erased because it becomes intuitively obvious. The arguments against slavery, against cruel and unusual punishment, against unjust wars, against treating children cruelly—these all took arguments.

About 30 years ago, the philosopher Peter Singer started to argue about the way animals are treated in our factory farms. Everybody thought he was nuts. But I’ve watched this movement grow; I’ve watched it become emotional. It has to become emotional. You have to draw empathy into it. But here it is, right in our time—a philosopher making the argument, everyone dismissing it, but then people start discussing it.”