John Chrysostom
What are you doing, Paul? You have lifted up our souls and raised them to the height. You have shown what is great and ineffable.
You have spoken of the Gospel, and of the Gospel of God. You have presented the assembly of the prophets and shown that they foretold the future many years beforehand. Why do you bring us down again to David?
Tell me, of what man are you speaking when you name the father of Jesse's son? Is this consistent with what was said before?
It is entirely consistent, Paul says, because our discourse is not about a mere man. For this reason I added "according to the flesh," giving to understand that another birth also belongs to Him, according to the Spirit.
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But why did he begin with the birth according to the flesh, and not with the higher birth, according to the Spirit? Because Matthew, Luke, and Mark begin so.
Moreover, one who intends to lead upward to heaven must guide from below upward. So it also happened in reality. The Son of God was seen on earth as man, and then acknowledged as God.
The way of teaching used by Him Himself is also the path leading to Him, which His disciple lays down. He first speaks of the birth according to the flesh, not because it was first.
He does so in order to lead the hearer from it to the other birth, according to the Spirit.