9 I sent a letter to the church, but Diotrephes, whose desire is ever to have the first place among them, will not have us there. 10 So if I come, I will keep in mind the things he does, talking against us with evil words: and as if this was not enough, he does not take the brothers into his house, and those who are ready to take them in, he keeps from doing so, putting them out of the church if they do.
11 My loved one, do not be copying what is evil, but what is good. He who does good is of God: he who does evil has not seen God.
12 Demetrius has the approval of all men and of what is true: and we give the same witness, and you are certain that our witness is true.
Matthew Henry's Commentary on 3 John 1:9-12
Commentary on 3 John 1:9-12
(Read 3 John 1:9-12)
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.