Verse 9: Everyone who goes ahead and does not remain in the teaching of Christ does not have God. Whoever remains in the teaching has both the Father and the Son.
Verse 10: If anyone comes to you and does not bring this teaching, do not receive him into your house or give him any greetings (or: “rejoicing” chairen).
Verse 11: For whoever greets him (shares in; fellowships with; associates in mission) fellowships in his evil works.
Verse 12: Though I have much to write to you, I would rather not use paper and ink. Instead, I hope to come to you and talk face to face so that our joy may be complete.
Verse 13: The children of your elect sister greet you.
Notes: There is a liturgical exchange taking place in the church. They greet one another, which is a way of building orthodoxy among them. Those who do not greet do not understand the life of the Church and are to be chastised. Hospitality is greater than simply providing food.
