Romans
Romans was written by Paul in Corinth (~AD 56–57), while preparing to carry a collection to Jerusalem's churches and then travel to Spain via Rome (15:23–28). It is therefore not a founding letter (Paul did not found the Roman church) nor a response to specific crises — it is a systematic exposition of the gospel addressed to a community Paul had not yet met personally.
Romans' historical influence is unparalleled: it triggered Augustine's conversion (AD 386), Luther's Reformation (1517), and Wesley's renewal (1738). Calvin called it "the key to the understanding of all Scripture".
The Roman church was mixed: Jewish Christians expelled by Claudius (~AD 49) and Gentiles who built the community in their absence, now returning after Claudius's death (AD 54). There is tension between the "strong" (Gentiles, freer regarding diets and holy days) and the "weak" (Jewish Christians, still bound by Torah scruples). Romans 14–15 addresses this directly.
Romans' theme is declared in 1:16–17: the gospel is "the power of God for salvation" because in it "the righteousness of God is revealed from faith for faith". Paul uses dikaiosynē (righteousness/justice) in two intertwined senses: the righteousness of God (his faithful and just character) and the righteousness imputed to the believer (a forensic declaration of not-guilty). Justification is not becoming morally righteous, but being declared righteous before the divine tribunal — on the basis of Christ's perfect obedience credited to the believer through faith (4:1–8; 5:18–19).
The argument of Romans 1–4 is progressive: both Gentiles (1:18–32) and Jews (2:1–3:8) are under condemnation. No one has fulfilled God's law; all have "fallen short of the glory of God" (3:23). Therefore, the only hope is justification as a gift of grace, through the redemption in Christ Jesus (3:24) — and the biblical model is Abraham, who was justified before circumcision, by faith (4:9–12).
After establishing justification, Paul develops sanctification (6–8): the believer has died to sin in Christ (6:1–14), struggles against the flesh by the Spirit (7–8:13), and has assurance that nothing will separate them from the love of God (8:31–39). Chapter 8 culminates in one of the NT's most sublime statements: all creation's expectation for the revelation of the sons of God (8:19–22).
Romans 9–11 confronts the problem of ethnic Israel: how does Israel's rejection of Christ harmonize with God's promises? Paul answers in three movements: (9) God's sovereign election was always selective, not ethnic; (10) Israel heard and rejected; (11) Israel's rejection is partial and temporary — "all Israel will be saved" when the fullness of the Gentiles comes in, culminating in doxology (11:33–36).
One of the most debated exegetical questions: who is the "I" of Romans 7:14–25 who says "I do not do the good I want, but the evil I do not want"? Two main traditions: (1) the regenerate believer, describing the ongoing struggle with the flesh even after conversion (late Augustine, Luther, Calvin); (2) the Jew before regeneration, describing the law's powerlessness without the Spirit (Origen, most Greek Fathers, Wright, Cranfield). The narrative structure favors the second: Rom 7 contrasts with Rom 8 ("there is therefore now no condemnation"), and the "I" of 7 has no Spirit — which is impossible for the believer of Rom 8.
Romans' practical second half opens with the great imperative: "present your bodies as a living sacrifice" (12:1) — the logical (logikēn) response to the gospel of chapters 1–11. What follows: sincere love (12:9–21), submission to governing authorities (13:1–7), love as the fulfillment of the law (13:8–10), and the ethics of the "strong" and "weak" (14:1–15:13) — where Paul demands that the strong in faith welcome the weak without despising them, because Christ welcomed both.
"Do not be conformed to this world, but be transformed by the renewal of your mind."
Romans 12:2 — ESV