She who is in Babylon, chosen together with you, greets you; and so does Mark, my son.
Mark my son -- Mark, called John Mark, was the spiritual son of Peter. Tradition indicates that Peter helped him write the Gospel of Mark (cf. Acts 12:12). This is the same Mark who once failed Paul (Acts 13:13; Acts 15:38, Acts 15:39; Colossians 4:10), but later became useful again for ministry (2 Timothy 4:11). - MSB