Anointed Lord of the nations; Spirit speaks in the prophets

In turn the prophet Isaiah said: ‘Thus says God the Lord to my Anointed, the Lord, whose right hand I have taken to bring the nations to obedience before him.’ (Isa 45:1 as read of Christ) How is the Christ called Son of God and king of the Gentiles — that is, of all human beings? David says that the Anointed, the Christ, is called and truly is Son of God and king of all. Here are his words: ‘The Lord said to me: You are my Son; today I have begotten you. Ask of me, and I will give you the nations as your inheritance and the ends of the earth as your possession.’ (Ps 2:7-8; Acts 13:33)

These words are not addressed to David, since he ruled neither the Gentiles nor the world and reigned only over the Jews. It is therefore plain that the promise made to the Christ to reign over the whole universe belongs to the Son of God. David himself acknowledges him as his Lord when he says: ‘The Lord said to my Lord: Sit at my right hand,’ and the rest already cited. (Ps 110:1; Mt 22:43-45)

For he says that the Father speaks with the Son. We have already seen the same in Isaiah: ‘God says to my Anointed, the Lord… to bring the nations to obedience through him.’ The same promise is made by both prophets: he will be king. Therefore God’s words address one and the same person — I mean the Christ, the Son of God. David says, ‘The Lord said to me.’ We must grant that it is neither David nor any of the other prophets who speaks on his own; for it is not the human being who prophesies, but the Spirit of God who, through the prophets, takes the figure and form of the person in question and speaks now in the name of the Christ, now in the name of the Father. (2 Pet 1:21)