That is why, if I come, I will call to remembrance his works which he goes on doing, chattering about us with wicked words.

Diotrephes was “chattering about” John with “wicked words,” thus maligning one of the apostolic foundation stones of heavenly New Jerusalem. (Revelation 21:2, 14) Surely, he could not do that with impunity! Nor can professing Christians today expect to escape God’s adverse judgment if they unrepentantly slander fellow believers and disregard divinely constituted authority.​—Leviticus 19:16; Jude 8-13.