John Chrysostom
Having spoken of what we have received, and having shown from the greatness of the gifts bestowed on us the love for mankind and the glory of God, Paul adds yet another point: before us no one knew this mystery.
He does the same in the Epistle to the Ephesians, when he says that neither angels, nor principalities, nor any other created power, but only the Son of God knows (Rom 8:38-39).
Therefore he did not simply say “hidden,” κεκρυμμένον, but “mystery,” άποκεκρυμμένον. This is both because, although it has now been accomplished, it is ancient, and because God willed this from of old and so ordained it beforehand.
But why this was so, he does not yet say.
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“Hidden from ages,” he says, “and from generations.” He rightly called that a mystery which no one knew except God. Where, then, is the “mystery”? In Christ, as he says in the Epistle to the Ephesians.
Or, as the prophet once said: “From everlasting to everlasting, Thou art God” (Ps 89:3).
“But now revealed,” he says, “to His saints.” Therefore all this is a work of God’s divine economy.
“But now,” he says, “revealed.” He did not say “it has been accomplished,” but “revealed to His saints.” If it has appeared only to the saints, then it is still hidden even now.
Therefore let them, the heretics, not deceive you. They do not know why the Apostle said it was given only to them.