Commentaries
2:7-9 The kingdom of the Messiah is founded upon an eternal decree of God the Father. This our Lord Jesus often referred to, as what he governed himself by. God hath said unto him, Thou art my Son, and it becomes each of us to say to him, Thou art my Lord, my Sovereign'. The Son, in asking the heathen for his inheritance, desires their happiness in him; so that he pleads for them, ever lives to do so, and is able to save to the uttermost, and he shall have multitudes of willing, loyal subjects, among them. Christians are the possession of the Lord Jesus; they are to him for a name and a praise. God the Father gives them to him, when, by his Spirit and grace, he works upon them to submit to the Lord Jesus.
7. The king thus constituted declares the fundamental law of His kingdom, in the avowal of His Sonship, a relation involving His universal dominion.
this day have I begotten thee—as 2Sa 7:14, "he shall be My son," is a solemn recognition of this relation. The interpretation of this passage to describe the inauguration of Christ as Mediatorial King, by no means impugns the Eternal Sonship of His divine nature. In Ac 13:33, Paul's quotation does not imply an application of this passage to the resurrection; for "raised up" in Ac 13:32 is used as in Ac 2:30; 3:22, &c., to denote bringing Him into being as a man; and not that of resurrection, which it has only when, as in Ac 2:34, allusion is made to His death (Ro 1:4). That passage says He was declared as to His divine nature to be the Son of God, by the resurrection, and only teaches that that event manifested a truth already existing. A similar recognition of His Sonship is introduced in Heb 5:5, by these ends, and by others in Mt 3:17; 17:5.