John Chrysostom
But how did He sit upon the throne? By being King over the Jews. And if He is King over the Jews, then still more over those who crucified Him.
Having spoken of the gift of the Holy Spirit, he now speaks boldly also of Christ's Ascension into heaven. He does not do this simply, but again brings forward a witness.
He reminds them of that very person to whom Christ Himself had pointed. "For David did not ascend," he says, "into the heavens."
Here the Apostle speaks without restraint, animated by what he said above. He no longer says, "Let it be permitted"; Acts 2:29, or anything similar.
He speaks plainly: "The Lord said to my Lord, Sit at My right hand, until I make Your enemies the footstool of Your feet."
If He is David's Lord, then He is still more their Lord. "Sit at My right hand." In this he expressed everything.