They say the state should not impose on its citizens a preferred way of life, but should leave them as free as possible to choose their own values and ends, consistent with a similar liberty for others.

Parenthood is a school for humility. We can't choose the precise traits of our children, and that is morally important. It teaches us what William May, a theologian whom I greatly admire, calls "an openness to the unbidden."

My goal is first of all to promote a public debate about where markets serve the public good and where they don't belong. That's my first goal.

Human beings are empowered to exercise dominion over nature and even to be participants in creation; and yet, at the same time, there are strictures against idolatry, which is a kind of overreaching and confusing human beings' role with God's.

I think very often when we think we are aiming at the best for our children, what we are really doing is trying to position them for competitive success in an intensely driven kind of society. I'm not sure that always leads to the good life or to happiness.

There are really exercises in a kind of consumerist ethic that I think don't have the same moral weight as medicine or health.

One can imagine a kind of hormonal arms race or genetic arms race, whether it's to do with height or IQ, conceivably, in the future. So it's limitless, and that's another of the features that sets it apart from medical intervention.