Therefore we ought to support such men, so that we may be fellow workers for the truth.
I. John receives a good report of Gaius's faith and charity from the brethren. Gaius’s love for the brethren and hospitality to strangers proves his sincerity in the faith. II. Gaius is commended for his hospitality, a virtue extended to strangers and those of different churches. III. John expresses great joy in hearing of Gaius's walk in truth.
Commenting on 3 John 1:3-8
We therefore ought to receive such,.... We who are Jews, that have believed in Christ, for such an one Gaius, it seems, as well, as the apostle, were, ought to receive such preachers of the word into our houses, and entertain them cheerfully, while they continue, and supply them with all necessaries when they depart: that we might be fellow helpers to the truth; that...
Verse 8. We therefore ought to receive such. All of us ought hospitably to entertain and aid such persons. The work in which they are engaged is one of pure benevolence. They have no selfish aims and ends in it.