Third John supplements statements on Christian hospitality in 2 John. It applauds a Christian named Gaius for living out the teachings of the apostles-he had welcomed traveling Christian missionaries into his home-while condemning Diotrephes, a selfish church leader who not only refused to help these itinerant, godly teachers but also had slandered and opposed those who disagreed with him. This book demonstrates that pride can divide Christians if they are not living by God's Word. To avoid the dual dangers of false teaching and division within the church, believers should practice the dual virtues of love and discernment. The letter was probably written by the apostle John in the late first century a.d.