David C. Grabbe: In II John 7, the apostle John identifies an antichrist as one who denies that Jesus Christ is presently in His followers. ...
David Grabbe, describing several contexts of the term "anti-Christ," points out that one meaning of anti-Christ is those who believe that Jesus Christ is not the Messiah, but a mortal, who may have been a good teacher, but was not a Savior or a literal Son of God. Two-thirds of the Abrahamic religions—Judaism and Islam— fall into this category. The apostle John dealt with a group of false apostles in the early Church who had embraced the Gnostic teaching of Docetism, which considers anything physical impure, thereby precluding Christ's physical presence as having any consequence, but considered only the other part of the dual nature, the spiritual, worthy of worship. The teaching of Docetism led to a passive idea of repentance, causing people to accept Jesus' sacrifice and grace, but reject any attempt at overcoming and living by His laws. Sadly, most professing Christians have accepted this deception, rejecting the idea that God's Holy Spirit lives within us, prompting us to walk in His commandments, enabling spiritual growth into the stature of Jesus Christ. They may claim to follow Him, but they reject His commandments. With God's Spirit in us, prompting spiritual growth, we will mature into the fullness of Christ. Without His Spirit, we will have the spirit of anti-Christ.
Martin Collins focuses on the second and third epistles of John, letters. Second John warns Christians against false teachers and the necessity not to let down their guard, realizing that deception is possible when they move 'progressively' against doctrines of Christ, as had occurred in the final years of the Worldwide Church of God. Third John was written to Gaius, whom John commended for his hospitality in welcoming genuine servants of God. John warns Gaius of the treachery of Diotrephes, who had arrogantly initiated a mutiny against God's true apostles and ministers, pompously assuming the behavior of putting out of the church those who did not follow his arrogant leadership (a practice sadly practiced in some of the splinter groups of the greater Church of God). Both Gaius and Demetrious are commended for their sterling receptivity of the truth as well as their generous hospitality, serving as lights to the world, while Diotrephes is rebuked for his arrogance and his caustic divisive behavior as is seen in his malicious gossip and hatred for God's true servants. Third John provides some practical counsel on dealing with friction and bitterness, attaining peace in the process.
Martin Collins indicates that, even though II and III John are the shortest books of the Bible, they do contain significant themes, amplifying the contents of I John, emphasizing the fellowship with God. II and III John, addressed to elders in supporting local churches, advocate hospitality to legitimate teachers and forbid supporting false teachers. II John provides tests of life, determining authenticity of genuine believers, as well as advocating faithfulness in large and small responsibilities, including the friends with which one chooses to associate, realizing that true wisdom is the right application of spiritual language. No conflict should ever exist between the spirit and the letter of the Law. The message of II John has special application today, where the church is also besieged by perennial schisms and heresies, not unlike the kind of problems experienced in the Corinthian congregation. Love for the truth automatically leads to love for one another within the congregation. A common commitment to the truth is the foundation of genuine Christian fellowship. In our quest for unity, we can never compromise with the truth. True love between brethren is impossible without an equal love for the truth, leading to a perpetual walking in the light of truth, elevating the Word of God over the traditions of man and every wind of questionable doctrine which inevitably leads to lawlessness. We have the obligation to test everything presented to our minds, examining it against the standard of the Scriptures, holding fast to the truth, filtering out and discarding any toxic prevarications.