Saints Have Complicated Problems
The two, Paul and Barnabas, disagreed at the beginning of the second missionary journey because Barnabas was determined to take with them as a companion John called Mark, whereas Paul was against it, since the young man had deserted them during their previous journey (cf. Acts 13:13; 15:36–40).
Hence there are also disputes, disagreements and controversies among saints. And I find this very comforting, because we see that the saints have not “fallen from Heaven”. They are people like us, who also have complicated problems.
Holiness does not consist in never having erred or sinned. Holiness increases the capacity for conversion, for repentance, for willingness to start again and, especially, for reconciliation and forgiveness.
So it was that Paul, who had been somewhat harsh and bitter with regard to Mark, in the end found himself with him once again. In St Paul’s last Letters, to Philemon and in his Second Letter to Timothy, Mark actually appears as one of his “fellow workers”.
Benedict XVI. (2013). General Audiences of Benedict XVI (English). Vatican City: Libreria Editrice Vaticana.