This epistle was written by the Apostle John, who calls himself an "elder", as in the preceding, and is inscribed to a friend of his, whom he mentions by name, and expresses a very great affection for, on account of his steady adherence to the truths of the Gospel, 3Jo 1:1; he wishes him bodily health equal to that prosperity of soul he was indulged with, 3Jo 1:2; congratulates him upon the testimony the brethren that came from him gave him of the truth being in him, and of his walking in it, and upon hearing that his children also trod in the same path, 3Jo 1:3; commends him for his hospitality and charity, of which testimonies were given before the church; and encourages him to go on doing the same acts of beneficence, since it was to such persons that went forth for the sake of Christ, and preaching in his name, and had nothing of the Gentiles for so doing; wherefore they ought to be received, and entertained by those of ability, that they might be fellow helpers to the truth with them, 3Jo 1:5.
He complains of Diotrephes as a proud, haughty, and overbearing man in the church, where Gaius was a member, who would neither receive the letters the apostle sent, nor the brethren that came with them; nay, forbid them that would, and cast them out of the church for it, and prated against them with malicious words, whom he threatens to remember when he himself should come thither, 3Jo 1:9; wherefore he exhorts Gaius not to follow such an ill example, but that which is good in any person; since he that does good appears to be of God, and he that does evil, it looks as if he had never known him, 3Jo 1:11.
And particularly he recommends Demetrius, who had a good report of all men, and of the truth itself, and had a testimony from the apostle, and those that were with him, which was known to be a true one, 3Jo 1:12.
But though he had many things to say, both of one, and of the other, he determines to write no more at present, hoping he should shortly see him, and personally converse together; and closes the epistle with his own good wish, and with mutual salutations of friends, 3Jo 1:13.
Ver. 1. The elder unto the well beloved Gaius,.... The elder is the writer of the epistle, the Apostle John, who so styles himself on account of his age, and office, as in the preceding epistle. The person to whom he writes is "the well beloved Gaius"; not that Gaius, who was the Apostle Paul's host, Ro 16:23, for though their characters agree, being both hospitable men, yet neither the place nor time in which they lived.
The Apostle Paul's Gaius lived at Corinth, this is in some place near to Ephesus, for the apostle in his old age purposed to come and see him shortly; the other was contemporary with Paul, this with John; there were thirty or forty years difference between them: besides, the Corinthian Gaius was baptized by Paul, and was doubtless one of his spiritual children, or converts, whereas this Gaius was one of the Apostle John's spiritual children, 3Jo 1:4; nor does he seem to be the same with Gaius of Macedonia, Ac 19:29, or with Gaius of Derbe, Ac 20:4, who seem to be two different persons by their country, though both companions in travel of the Apostle Paul; for which reason, as well as the time of their living, neither of them can be this Gaius, who was a settled housekeeper, and resided at some certain place.
His name is a Roman name, and the same with Caius, though he seems to have been a Jew, as he might, it being usual with the Jews in other countries to take Gentile names.