original-sin
+ NewAdam and Christ: The Two Heads of Humanity — Romans 5:12-21
Paul's clearest statement of the two representative heads is Rom 5:12-21: "as one trespass led to condemnation for all, so one act of righteousness leads to justification." Death reigned "from Adam," so that all are bound up with him. Augustine built the Western doctrine of original sin on this passage, reading the Latin in quo omnes peccaverunt as "in whom all sinned"; Trent received this, teaching that Adam's sin is transmitted to all and remedied only in Christ. Irenaeus had earlier framed Christ as the new Adam who recapitulates and heals humanity — the Eastern accent on restoration. The two heads structure the whole of redemptive history. The Adam-Christ parallel reaches back to the fall of Gen 3:17-19 and forward to the resurrection harvest of 1Cor 15:22: "as in Adam all die, so in Christ shall all be made alive." Bavinck treats this organic solidarity as the hinge of covenant theology.
The Fall and Original Sin — Genesis 3 and Romans 5
Gen 3:1-7 narrates the first disobedience: the serpent's question, the forbidden fruit, and the eyes that are opened to shame. The harmony of creation fractures in a single act. Augustine's reading of original sin became the West's standard: Adam's guilt and corruption pass to all his offspring. He found its warrant in Rom 5:12, "sin came into the world through one man." Aquinas refined it as the loss of original righteousness. The curse of 3:15-19 sets up the whole drama of redemption, and the Adam of this chapter is the representative head whose trespass Rom 5:18 contrasts with Christ's obedience. The fall is answered by the second Adam.