The apostle John commends the “beloved” Gaius for the fact that he is walking in the truth (cf. v. 1-4). In our text, John points out specific contributions to the truth that Gaius had made.

Hospitality is expected out of Christians (cf. Romans 12:13). The value of such is often missed by those who involve themselves in this kind act. John points out the significance of Gaius’ Christian duties he performed.

Gaius was hospitable to Christians who had decided to dedicate themselves to the proclamation of the truth. He showed his kindness to those he knew, and even strangers. He did this “in a manner worthy of God,” so he did well (v. 6). These individuals whom Gaius served did not solicit money from the Gentiles. Their motivation was purely for the gospel to be spread, and for God to be glorified. For this reason Christians, like Gaius, ought to support them in their efforts. In doing so, Gaius became a fellow worker for the truth (cf. v. 8)!

Note: This is why John instructed not to receive into your house, nor greet one who does not bring the doctrine of Christ. For in so doing you become a sharer in his evil deeds (cf. 2 John 9-11). Likewise, when we receive a proclaimer of the truth, we share in his good deeds.