Thirty-four years ago when I launched this column, I would never have said this: restlessness is not something to be cultivated, no matter how romantic that might seem.

Recently, at an academic dinner, I was sitting across the table from a nuclear scientist. At one point, I asked him this question: “Do you believe that there’s human life on other planets?” His answer surprised me: “As a scientist, no, I don’t believe there’s human life on another planet. Scientifically, the odds are strongly against it. But, as a Christian, I believe there’s human life on other planets. Why? My logic is this: Why would God choose to have only one child?”