Ps 2, 6-7 You are my son; today I am your father

(Ps 2, 6-7) You are my son; today I am your father

[6] "I myself have installed my king on Zion, my holy mountain." [7] I will proclaim the decree of the LORD, who said to me, "You are my son; today I am your father.

(CCC 745) The Son of God was consecrated as Christ (Messiah) by the anointing of the Holy Spirit at his Incarnation (cf. Ps 2:6-7). (CCC 441) In the Old Testament, "son of God" is a title given to the angels, the Chosen People, the children of Israel, and their kings (Cf. Dt 14:1; (LXX) 32:8; Job 1:6; Ex 4:22; Hos 2:1; 11:1; Jer 3:19; Sir 36:11; Wis 18:13; 2 Sam 7:14; Ps 82:6). It signifies an adoptive sonship that establishes a relationship of particular intimacy between God and his creature. When the promised Messiah-King is called "son of God", it does not necessarily imply that he was more than human, according to the literal meaning of these texts. Those who called Jesus "son of God", as the Messiah of Israel, perhaps meant nothing more than this (Cf. 1 Chr 17:13; Ps 2:7; Mt 27:54; Lk 23:47). (CCC 653) The truth of Jesus' divinity is confirmed by his Resurrection. He had said: "When you have lifted up the Son of man, then you will know that I am he" (Jn 8:28). The Resurrection of the crucified one shows that he was truly "I Am", the Son of God and God himself. So St. Paul could declare to the Jews: "What God promised to the fathers, this he has fulfilled to us their children by raising Jesus; as also it is written in the second psalm, 'You are my Son, today I have begotten you.'" (Acts 13:32-33; cf. Ps 2:7). Christ's Resurrection is closely linked to the Incarnation of God's Son, and is its fulfilment in accordance with God's eternal plan. (CCC 2836) "This day" is also an expression of trust taught us by the Lord (Cf. Mt 6:34; Ex 16:19), which we would never have presumed to invent. Since it refers above all to his Word and to the Body of his Son, this "today" is not only that of our mortal time, but also the "today" of God. If you receive the bread each day, each day is today for you. If Christ is yours today, he rises for you every day. How can this be? "You are my Son, today I have begotten you." Therefore, "today" is when Christ rises (St. Ambrose, De Sacr. 5, 4, 26: PL 16, 453A; cf. Ps 2:7).