3 John 5-8
Dear friend, you are faithful in what you are doing for the brothers, even though they are strangers to you. They have told the church about your love. You will do well to send them on their way in a manner worthy of God. It was for the sake of the Name that they went out, receiving no help from the pagans. We ought therefore to show hospitality to such men so that we may work together for the truth.
Gaius was faithful to show hospitality to the travelling evangelists even with his health problems. The reports of his love had gotten back to the church and, as we shall see, that caused some problems. John reassures Gaius that he is doing what Jesus would do and that, in fact, all believers should be working together for the sharing of the gospel. The same is true for us, today, in that we should all be working together to share the light of Jesus with this dark world.