Third Epistle of John

Concise Bible Dictionary:

This is addressed to “the beloved Gaius,” but whether he is the same person as either of those mentioned elsewhere is not known. Gaius is commended for receiving and helping on those that traveled about doing the Lord’s work; and Diotrephes is denounced for refusing to aid such, and for putting some out of the assembly. The spirit of clericalism was found thus early in the church. The apostle had no greater joy than to hear that his children were walking in the truth, which was ever precious to him. Demetrius is commended, and greetings sent to Gaius and to “the friends.”

Bible Handbook:

This is addressed to the beloved Gaius, but there are several of this name mentioned in the New Testament. The second epistle describes those who are to be refused; this shows who are to be received.
After declaring that the greatest joy of the apostle was to hear that his children walked in the truth, the apostle commends Gaius for receiving and helping on those that traveled about doing the Lord’s work. He denounces Diotrephes who did not receive such, and who even put some out of the assembly; the evil of clericalism being clearly manifest in this. Gains was not to follow evil. The apostle commends Demetrius, and sends greetings to Gaius and to the friends.

Related Books and Articles:

The Epistles of John
Narrator: Ivona Gentwo
Duration: 1hr 42min
Notes on John's Epistles
Duration: 1hr 50min
The Third Epistle of John
Narrator: Ivona Gentwo
Duration: 2min