Do you know what a Dear John letter is? Do you know there is one in the Bible. A young man by the name of John Mark worked and labored in the field with Paul but at on stop on a journey he deserted him. Why? Later Barnabas wants him to go along on another journey and Paul objects, an argument starts and the two apostles split ties. There is never an explanation as to why John Mark left, but this whole story has something to teach us about the church, young people and discipling them.