John sets Gaius’s faithful hospitality beside Diotrephes’s selfish and damaging leadership. Diotrephes loves to be first, rejects John and his associates in their rightful apostolic standing, slanders them, refuses traveling gospel workers, blocks others from helping them, and expels those who do. John therefore says he will expose these deeds when he comes.

In these verses, John moves from the good example of Gaius to the opposite example of Diotrephes. Gaius welcomed traveling Christian workers and so shared in the truth. Diotrephes does the opposite.

John says, “I wrote something to the church.” The most natural sense is that John had sent an earlier letter to this congregation, even though that letter has not been preserved. This matters because it shows the church had already received apostolic instruction. The issue, then, is not a small disagreement. Diotrephes is refusing to acknowledge John and those with him in their rightful standing.

John describes Diotrephes as one “who loves to be first among them.” This does not mean he was simply a capable leader or a prominent man in the church. It means he wanted preeminence. He wanted the leading place for himself. That self-exalting desire helps explain everything that follows.

John is not complaining merely about a difficult personality. He points to an ongoing pattern of sinful behavior. First, Diotrephes does not acknowledge John and his associates. In context, this is more than a lack of courtesy. He is refusing to receive their legitimate apostolic standing and their representatives. Second, he spreads malicious and unjustified charges against them. His speech is not merely harsh. John identifies it as evil.

Nor does Diotrephes stop there. John says he is “not content with that.” He also refuses to welcome “the brothers.” These are best understood as the same traveling Christian workers mentioned earlier in verses 5–8, men who went out for the sake of Christ’s name. So this is not just about manners or social hospitality. In this letter, receiving such workers is a real expression of partnership in the truth and support for the gospel mission.

Diotrephes goes further still. He prevents others in the church from receiving these brothers. This shows he had enough influence to control what happened in the congregation. And when some wanted to do what was right and welcome these workers, he put them out of the church. The wording points to real exclusion from the congregation’s fellowship. The exact procedure is not explained, so we should not build a full model of church government from this verse alone. But the abuse is plain: church discipline or church power was being used against people who were acting faithfully.

John then says, “if I come, I will call attention to the deeds he is doing.” This is not an empty threat or a burst of temper. John means that when he arrives, he will bring these actions into the open and hold Diotrephes accountable. The focus is on observable deeds, not rumor or personal revenge.

The movement of the passage is important. It begins with inward ambition—a love of first place. It then moves to sinful speech—malicious and evil words. From there it leads to concrete actions: refusing Christian workers, blocking others, and throwing out those who would welcome them. John presents this as a serious corruption of leadership.

So this passage warns the church not to judge leaders merely by force of personality or visible control. A leader must be evaluated by his relation to the truth, by the way he speaks, and by how he treats faithful servants of Christ. It also shows that supporting gospel workers is not an optional kindness. It is part of walking in the truth. And when someone uses influence in the church to suppress what is true and punish those who do good, that conduct must be exposed and addressed.

Key Truths: - Diotrephes’s desire for first place is presented as the root of his sinful conduct. - His actions include refusing to acknowledge John and his associates, slandering them, refusing gospel workers, blocking others, and throwing out those who welcome the brothers. - The issue is not a personal quarrel but a serious pattern affecting the church’s faithfulness to the truth. - In this letter, welcoming faithful Christian workers is a meaningful part of partnership in the gospel. - John’s promised response is orderly accountability based on observable deeds, not personal retaliation.