The final greetings arrive in a cluster — Timothy, Lucius, Jason, Sosipater, Tertius (who notes that he wrote this letter, the scribe whose hand Paul dictated into), Gaius, Erastus the city treasurer, and Quartus. A room full of people around the man finishing one of the most consequential letters ever written. They send their greetings with it.

And then Paul closes.

"Now to Him who is able to establish you according to my gospel and the preaching of Jesus Christ, according to the revelation of the mystery which has been kept secret for long ages past, but now is manifested, and by the Scriptures of the prophets, according to the commandment of the eternal God, has been made known to all the nations, leading to obedience of faith; to the only wise God, through Jesus Christ, be the glory forever. Amen" (Romans 16:25–27).

One sentence. Long enough to hold the whole letter in it.

Him who is able to establish you — the one who can make what the letter has argued actually real in the life of the people who have received it. Not Paul's ability. Not the congregation's effort. God's ability to establish, to make firm, to ground what has been built.

According to my gospel and the preaching of Jesus Christ — the gospel Paul has unpacked through sixteen chapters. It is not Paul's original material. It is the gospel of God, concerning His Son, promised beforehand, fulfilled in history, received through faith. Paul has been its servant and messenger. Now it goes with the letter.

The revelation of the mystery kept secret for long ages but now manifested — what the prophets spoke in shadow is now visible in full light. The inclusion of the Gentiles, the justification of the ungodly through faith in Christ, the mystery of God's purposes for Jew and Gentile together — these were hinted at across the whole sweep of the Old Testament and disclosed fully in the gospel.

Made known to all the nations — this is the movement of the letter, the movement of Paul's life, the movement of the gospel itself. From Jerusalem to Illyricum. From Illyricum to Rome. From Rome, God willing, to Spain. It does not stop. The nations are the destination, and the mystery that was hidden is what makes it to them.

Leading to obedience of faith.

The letter ends where it began. Romans 1:5: "to bring about the obedience of faith among all the Gentiles for His name's sake." Romans 16:26: "made known to all the nations, leading to obedience of faith." The frame is closed. The whole argument between those two phrases — sin, grace, justification, life in the Spirit, God's faithfulness, the living sacrifice — has been an extended unfolding of what the obedience of faith means and why it matters.

The last word before the Amen is not a doctrine or a command. It is an ascription.

To the only wise God, through Jesus Christ, be the glory forever.

He is the only wise God — wise enough to make propitiation the answer to wrath, faith the answer to sin, resurrection the answer to death, the Gentiles the answer to Israel's stumbling, and love the answer to everything that follows. Through Jesus Christ — the Son in whom the promises were kept, by whom the righteousness was provided, in whom the Christian lives and hopes. Be the glory — not borrowed glory, not reflected glory, but the glory that belongs to Him as the source and sustainer and goal of everything.

Forever.

Amen.

The series is complete.