Live in the truth

3 John 1-15
This is a personal letter from the Elder to his friend Gaius. The name was a common one at the time, and there is nothing to connect this Gaius with any of the others mentioned in the New Testament. He may have been a leader of the church  at Pergamum.
More important, Gaius was a man who lived in the truth.
John pray the elder and fried that you may enjoy good health and that all may go well with you, eve as your soul is getting along well.
No greater joy than to hear that my children are walking in the truth.
John encourage to show hospitality to those who are for the sake of the Name that they went out, receiving no help from the pagans, so that we may work together for the truth.
Diotrephes who loves to be first, will have nothing to do with us. He refuses to welcome the brothers, he also stops those who want to do so and put them out of the church. He damaging John's own character, suppressing his letter, spreading lies, hugging his own position as leader and hindering missionary outreach.
Demetrius is well spoken of by everyone- and even by the truth itself. We also speak well of him, and you know that our testimony is true.
Why?
Diotrephes , Gaius, a man of integrity, is doing all in his power to help his fellow Christians, especially the travelling evangelists and teachers who depended on Christian hospitality and support.
The situation here is clearly very different from that of the church in 2 John, where members are faced with false teachers they are warned against welcoming.
How?
Love one another includes all brothers who working for the Name of God, doing missionary outreach. Some fight for the Lord in different places, some are support  them what they needed, we are work together, this is the Love from God. Pray for the missionary in the world.