Why does everyone take for granted that we don't learn to grow arms, but rather, are designed to grow arms? Similarly, we should conclude that in the case of the development of moral systems; there's a biological endowment which in effect requires us to develop a system of moral judgment and a theory of justice, if you like, that in fact has detailed applicability over an enormous range.

Optimism is a strategy for making a better future. Because unless you believe that the future can be better, it’s unlikely you will step up and take responsibility for making it so. If you assume that there’s no hope, you guarantee that there will be no hope. If you assume that there is an instinct for freedom, there are opportunities to change things, there’s a chance you may contribute to making a better world. The choice is yours.

The responsibility of the writer as a moral agent is to try to bring the truth about matters of human significance to an audience that can do something about them.

For thirty years, Isreal has been highjacking ships in international waters, killing people, taking hostages, bringing them to Israel, putting them in secret prisons, all with the help of the United States. That's serious piracy.

It hardly takes more than a day in Gaza to begin to appreciate what it must be like to try to survive in the world’s largest open-air prison.

You never need an argument against the use of violence, you need an argument for it.

It's this kind of wild unpredictability, megalomania, thin-skinned craziness that really has me worried, more than [Donald Trump] statements. Now, on the climate change there's just nothing to say, he's perfectly straightforward.