What the apostle John did for his friend Gaius in the first century is a dying art in the twenty-first century. John wrote him a letter.

One writer for the New York Times, Catherine Field, said, “Letter-writing is among our most ancient of arts. Think of letters and the mind falls on Paul of Tarsus,” for example. And we can add the apostle John.

In his letter to Gaius, John included hopes for good health of body and soul, an encouraging word about Gaius’s faithfulness, and a note about his love for the church. John also spoke of a problem in the church,…