The Third Letter of John is the shortest book in the New Testament, yet it offers a valuable glimpse into early church life and the importance of Christian hospitality and integrity. Written by the apostle John to a believer named Gaius, the letter contrasts the faithful actions of some church members with the pride and resistance of others. Its central theme is the importance of supporting true gospel workers and walking in truth.

John begins by commending Gaius for his spiritual health and faithful living. He rejoices to hear that Gaius is walking in the truth and practicing love by welcoming and supporting traveling Christian missionaries. These workers had gone out for the sake of the name of Christ and accepted no help from unbelievers, so John encourages Gaius to continue partnering with them as an expression of true fellowship.

In contrast, John warns about a man named Diotrephes, who refuses to acknowledge apostolic authority, speaks maliciously, and even expels faithful believers from the church. Diotrephes' pride and divisiveness are condemned, and John plans to confront him if he visits. This sharp warning shows that leadership without humility endangers the church’s witness and unity.

John also commends another believer named Demetrius, who is well spoken of by everyone and lives in accordance with the truth. By highlighting both good and bad examples, the letter encourages believers to imitate what is good and faithful, not what is proud and self-serving.

The letter concludes with John’s desire to speak face-to-face rather than with ink and pen. 3 John affirms that truth, love, and hospitality are essential in the Christian life, and that faithful support of gospel workers is a vital expression of obedience to Christ.