…having on the BREASTPLATE OF RIGHTEOUSNESS

Paul was certainly familiar with the armor of the soldier. Rome had control over Palestine in his day. As a young Pharisee in Jerusalem, he had often taken notice of the military, since the Roman garrison was headquartered at the Antonia Fortress adjacent to the Temple area, where Paul had spent much time in his early years. While writing the Epistle to the Ephesians, Paul was a prisoner of Rom