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 was kept secret since the world began,
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Ambrosiaster
AD 400
Paul gives glory to God the Father, from whom are all things, that he might be pleased to fill the congregation of the Romans with his grace, as he can do by confirming their minds in faith for the advancing of the gospel and the revelation of the mystery hidden for long ages, which has now been made manifest in Christ. Commentary on Paul’s Epistles.
Now to him that is able These three last verses, in divers Greek copies, were found at the end of the 14th chapter, where we find them expounded by St. Chrysostom.
According to the. Mystery kept secret from eternity, now made manifest; he means the mystery of Christ's incarnation, and man's redemption, formerly revealed indeed to the prophets, but now made known to all nations, in order to bring all men to the obedience of the gospel, by embracing the faith and doctrine of Christ. (Witham)
Here Paul prays for them on the assumption that they are not yet firmly fixed but are still wavering. In order to back up what he says, he bases it all on “the preaching of Jesus Christ,” by which he means the things that Jesus himself preached. For if Christ preached it, the teaching is not Paul’s, but his…. Furthermore, to be let in on the secret, especially on one which had been kept for such a long time, is a sign of the greatest intimacy and friendliness.
But though He is Himself also a spirit, yet He proceeded from the mouth of God with voice and sound, as the Word, on this account indeed, because He was about to make use of His voice to the people; that is, because He was about to be a teacher of the knowledge of God, and of the heavenly mystery