“But John left them and returned to Jerusalem.” Who is this John? We know him as John Mark or just plain Mark, the cousin of Barnabas. Paul would harbor real anger toward Mark and cause a split with Barnabas because Mark refused to go with him on this missionary journey. Maybe, Paul thought Mark was afraid. It would take years before they would be reconciled (as we know they were from Paul’s letters) Even someone as great as Paul can have difficulty in forgiving. Are you having difficulty forgiving someone? It is never too late to reconcile.