John Chrysostom
What has been said is not entirely clear because of the literal connection of the expressions. Therefore the discourse must be divided. What, then, do these words mean?
We preach, Paul says, Him who came from David. But this is clear. By what is it proved that the One incarnate is the Son of God?
First, by the prophets, for Paul said, "which He promised beforehand through His prophets in the holy Scriptures" (Rom 1:2). This manner of proof has no small force.
Second, by the very manner of the birth, which the Apostle expresses in the words, "from the seed of David according to the flesh" (Rom 1:3), since this birth broke the order of nature.
Third, by the miracles which Christ performed, thereby proving extraordinary power. This is expressed by the word "in power."
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Fourth, by the Spirit whom He gave to those who believed in Him, and through whom He made all holy. Therefore it is said, "according to the Spirit of holiness," since it belongs to God alone to distribute such gifts.
Fifth, by the Resurrection of the Lord, because He was the first and the only One who raised Himself. He Himself called this the sign especially sufficient above all others to stop even shameless mouths.
He said: "Destroy this temple, and in three days I will raise it up" (Jn 2:19). And again: "When you lift Me up from the earth, then you will know that I am He" (Jn 8:28).
And again: "This generation seeks a sign, and no sign shall be given to it except the sign of Jonah" (Mt 12:39).
What, then, does "declared" mean? It means indicated, revealed, acknowledged, and confessed by the judgment and decision of all.
This happened through the prediction of the prophets, through the wondrous birth according to the flesh, through the power shown in miracles, through the Spirit by whom He granted sanctification, and through the Resurrection by which He destroyed the dominion of death.
To another is given sanctification of soul and body, and this is called the spirit of holiness. So the Apostle says: "Paul, a servant of Jesus Christ, called to be an Apostle, set apart for the Gospel of God, which God promised beforehand through His prophets," according to the Spirit of holiness (Rom 1:1, 1:2, 1:4).
He said this in reversed order, and the meaning of his words is this: "Paul, who became an Apostle according to the Spirit of holiness." Many, following the first expression, thought that Paul speaks of the Son of God as foreordained "according to the Spirit of holiness."
Yet in fact this is not so. On the contrary, in this place it is said that Paul was appointed as an Apostle "according to the Spirit of holiness." When was he appointed?
After the resurrection of Jesus Christ. Since the other Apostles were chosen before the sufferings of Christ, but he after Christ's Resurrection, it is therefore said, "according to the Spirit of holiness."