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Demetrius hath good report - Perhaps another member of the Church where Caius was; or he might have been one of those whom the apostle recommends to Caius; or, possibly, the bearer of this letter from John to Caius. He seems to have been an excellent person: all testified of his righteousness; the truth - Christianity, itself bore testimony to him; and the apostles themselves added theirs also.

Demetrius hath good report of all men - Little is known of Demetrius. Lucke supposes that he resided near the place where the author of this Epistle lived, and was connected with the church there, and was probably the bearer of this Epistle. It is impossible to determine with certainty on this point, but there is one circumstance which seems to make it probable that he was a member of the same church with Gaius, and had united with him in showing Christian hospitality to these strangers. It is the use of the phrase “hath good report of all,” implying that some testimony was borne to his character beyond what the writer personally knew. It is possible, indeed, that the writer would have used this term respecting him if he lived in the same place with himself, as expressing the fact that he bore a good character, but it is a phrase which would be more appropriately used if we suppose that he was a member of the same church with Gaius, and that John means to say than an honorable testimony was borne of his character by all those brethren, and by all others as far as he knew.

And of the truth itself - Not only by men, who might possibly be deceived in the estimate of character, but by fact. It was not merely a reputation founded on what “appeared” in his conduct, but in truth and reality. His deportment, his life, his deeds of benevolence, all concurred with the testimony which was borne by men to the excellency of his character. There is, perhaps, particular reference here to his kind and hospitable treatment of those brethren.

Yea, and we also bear record - John himself had personally known him. He had evidently visited the place where he resided on some former occasion, and could now add his own testimony, which no one would call in question, to his excellent character.

And ye know that our record is true - This is in the manner of John, who always spoke of himself as having such character for truth that no one who knew him would call it in question. Every Christian should have such a character; every man might if he would. Compare the notes at John 19:35; John 21:24.

Both the heart and mouth must be watched. The temper and spirit of Diotrephes was full of pride and ambition. It is bad not to do good ourselves; but it is worse to hinder those who would do good. Those cautions and counsels are most likely to be accepted, which are seasoned with love. Follow that which is good, for he that doeth good, as delighting therein, is born of God. Evil-workers vainly pretend or boast acquaintance with God. Let us not follow that which is proud, selfish, and of bad design, though the example may be given by persons of rank and power; but let us be followers of God, and walk in love, after the example of our Lord.