Pelagius — on Rom 13:8 (PELAGIUS'S COMMENTARY ON ROMANS)

“Do not fail to repay debts. Only the debt of love should remain, because it can never be paid in full. According to the parable of the Lord, who bids us show mercy to everyone without distinction, we must think of every person as our neighbor. Paul mentioned love first because he was writing to the faithful and dealing with behavior proper to righteousness.”