ISB ~ Romans 1 v5

the obedience of faith:Probably means “the obedience that is faith” or “the obedience that springs from faith”. The expression stands like two bookends at the beginning and end of Romans (16:26). It holds the epistle together around the central theme of faith, which is the act of trusting in God and entrusting oneself to God. Faith inspires love (Gal 5:6) and is the indispensable basis for a living relationship with Christ (Rom 1:17; Heb 11:6) (CCC 143, 1814).

among all the nations:Paul was appointed an apostle both to the “Gentiles” (11:13) and to the “sons of Israel” (Acts 9:15).