Conclusion of Seyoon Kim's "The Atoning Death of Christ on the Cross"...
Thus, when the doctrine of Christ’s penal substitutionary atonement on the cross—and the doctrine of justification that issues from it—is properly expounded, it can integrate the Christus victor motif in itself and provide the adequate basis for sanctification or imitatio Christi. Hence Paul uses penal substitutionary atonement for his moral exhortation not to sin against brethren, especially the “weak” ones (“the brother for whom Christ died,” Rom 14:15; 1 Cor 8:11), and not to sell one’s body into slavery either of sexual lust or of a human master (“You were bought with a price,” 1 Cor 6:20; 7:23). Above all, in expounding the missionary and social implications of the doctrine of justification, Paul makes the most revolutionary declaration: “There is neither Jew nor Greek, there is neither slave nor free, there is neither male nor female; for you are all one in Christ Jesus” (Gal 3:28; cf. also Rom 3:30; Eph 2:11-22; Col 3:11). Since justification does not depend on any innate quality or merit of human beings, but it is only by God’s grace manifested in Christ’s substitutionary atonement, and solely through our faith-appropriation of it, racial, gender, or social differences do not count any more.
