The most fateful change that unfolded during the past three decades was not an increase in greed. It was the expansion of markets, and of market values, into spheres of life where they don’t belong.

If we go too far down the road of choosing the genetic traits of children, my worry is that parenting will be less a kind of school for humility than it should be, and we will become too accustomed to regarding children as instruments of our ambition and of our desires.

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."

What I really want for my children is that they be loved and that they be happy and that they lead a good life.

There are some religious traditions that view human beings as participants in creation. This is true of the Jewish tradition, from which I come.

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.

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.