13:8–10 · Paul returns to love as the fundamental criterion of behavior. Loving others—being actively concerned for others, having affectionate regard for and interest in others—is an obligation (13:8a). The people to be loved are Christians, but also the neighbor who is the enemy (12:14, 17, 21). The reason and motivation for loving others is given in verses 8b–10. Believers who love others have fulfilled the law; they have properly done what the law asks (Rom. 8:4; cf. Matt. 5:17–20). The commandments of the law, which establish human relationships—no adultery, no murder, no stealing, no envious desires (cf. Exod. 20:13–17; Deut. 5:17–21)—are summed up in the commandment to love others as much as one loves oneself (Lev. 19:18, the most frequently cited passage of the Pen…