I don't think nationalism is alone holding the field; it's in contention with a lot of different things.

The traditional view of the sanctity of human life will collapse under pressure from scientific, technological and demographic developments.

Can we really believe that we are living a good life, an ethically decent life if we don't do anything serious to help reduce poverty around the world and help save the lives of children or adults who are likely to die if we don't increase the amount of aid we are giving.

What you could say, and what I do argue in the book, is that he doesn't have as much concern for the lives of Iraqis as he does for the lives of Americans, or even frozen American embryos.

Scholars have long dreamed of a universal library containing everything that has ever been written.

Nineteen thousand children [are] dying every day. Does it really matter that we're not walking past them in the street? Does it really matter that they're far away? I don't think it does make a morally relevant difference.

Looking back on my career, I think I've been extremely fortunate to be in the right place at the right time in order to have the influence that I did.