John Chrysostom
“Gaius, my host,” ξενος, “and the host of the whole Church greets you.” Do you notice what crown the Apostle wove for him, bearing witness to such great hospitality and gathering the whole Church into his house?
By the word ξενος he here means a host. When you hear that Gaius received Paul in his house, admire not only Gaius’s generosity, but also his strict life.
If Gaius had not been worthy of Paul’s virtues, Paul would not have gone to his house.
Striving to fulfill many of Christ’s commandments beyond what they prescribed, the Apostle would not have transgressed the law that commanded one first to inquire about those who receive guests, and to stay in the houses of the worthy.
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“Erastus, the city treasurer, greets you, and Quartus the brother.” The Apostle did not add the words “city treasurer” without reason.
As he also wrote to the Philippians, “Those of Caesar’s household greet you,” Phil 4:22, to show that the preaching had reached distinguished people, so here he mentions Erastus’s rank with the same purpose.
By this he gives us to understand that neither wealth, nor official cares, nor anything similar is an obstacle to salvation for a man attentive to himself.