There is no doctrine laid out in 3 John. It is a strictly a personal letter. This author pointed out the importance of hospitality for those who were working to spread the gospel. 3 John is the shortest book of the Bible by word count, although 2 John has fewer verses. 3 John is the only New Testament book which does not contain the names “Jesus” or “Christ”. The original Greek uses the term Ὀνόματος, generally translated as “name”, referring specifically to the “Name of Jesus”. However, the text does not explicitly say “Jesus” or “Christ”. Can a New Testament book not name Jesus?