The Letter to the Hebrews in the New Testament reminds us of that incident, and counsels Christians to make hospitality a Christian virtue. "For you may be entertaining angels unaware." But more than that, you may be doing it to Christ, who said, "If you have done it to the least of these, you have done it to me."

Tom Long teaches at the seminary at Princeton. But for a while he lived in Atlanta, and attended a Presbyterian Church in downtown Atlanta. Like most downtown churches, it has to cope with the problem of the homeless. So they opened up their gymnasium in the winter as a shelter. It was the practice of that church, as it is in this church when we …