Thus, the Messiah takes on the role of a narrative, a proclamation, a preaching that is open, faithful, tireless, and glorious to His Father, and savific for humanity, fulfilled both through His own words and through the voices of the Apostles and other ministers of the New Testament (cf. Rom. 15:8; Is. 61:1; Lk. 4:18). This aspect of His redemptive mission embodies the prophetic ministry, which is expressed through the spoken word.
Command. This term encompasses the entirety of the Gospel message concerning God’s grace towards us through Christ, which Christ Himself communicated with such precision that He refrained from uttering anything other than what the Father instructed Him to convey (cf. Jn. 14:31; Jn. 12:49; Jn. 5:30; Jn. 6:40; Jn. 8:28; Jn. 18:37; Lk. 4:18, 43). As the Lord had earlier expressed in verse 6, the Messiah (alongside the Lord in verse 2) continues to articulate the will and decree of the Lord regarding the establishment of His chosen King over Zion, which was His eternal Word, or only begotten Son, born of David's lineage, made incarnate to become the Redeemer, Savior, and King of humankind.
The Lord shall speak unto me. This indicates that just as the Father made known His will in instituting a King over Zion and establishing the kingdom (verse 6), I, the Messiah, will likewise announce the foundations of this kingdom. Despite being the son of David in terms of lineage, I am fundamentally the eternal Son of God, whom the Father identifies as eternally begotten. By uniting hypostatically with mankind from the lineage of David, I became the King of a new kingdom, destined for all languages to partake in.
It is unnecessary to investigate the specific time and place of the Father’s declaration; whether we consider it in light of the eternal definition or its temporal fulfillment, we constantly hear the Father affirming the Messiah as His only begotten and essential Son. This proclamation was made at the Annunciation (see: Luke 1:32), at the Baptism (see: Matthew 3:17), and at the Transfiguration (see: Matthew 17:5). The Father directs all attention to the Son, and the Son requires no self-exaltation (cf. Jn. 5:23; cf. Ps. 109:1).
My Son art Thou. This designation signifies a relationship not of adoption or mere fondness as with angels (see Job 1:6) or leaders (see Psalm 81:6) but refers to the only-begotten Son (see Jn. 1:14; Jn. 3:16, 18)—the true and essential Son (see Rom. 8:32), beloved (cf. Matt. 3:17; Matt. 17:5; 2 Pet. 1:17). This relationship can only arise from an eternal and substantial birth (cf. Heb. 1:5), making the Parent and the Begotten of the same essence; hence this Son is described as being in the bosom of the Father (cf. Jn. 1:1-2). He is both with God and is God (see John 1:18).
Jehovah, or the Father, is also referenced in Proverbs (see: Proverbs 30:4). Now, referring to the immutable eternity, which is devoid of past or future, or before the creation of the world (see: Jn. 17:5; Proverbs 8:21-24; Micah 5:2). For God, a thousand years are as a day in His sight, like yesterday or a night watch (see: Ps. 89:5; 2 Pet. 3:8). Today doesn’t signify a specific moment, as the Son’s emergence is from the very beginning of the ages (see: Micah 5:2; Matt. 2:5-6). The term "Now" reflects eternity. To affirm that the birth is perfect, He uses the term begotten. Recall the Lord’s statement: Before Abraham was, I am (cf. John 8:58).
I begot You signifies that I share with You the same divine nature and hold You in a manner beyond comprehension, yet without separation. This is why the Lord states: The Father is in Me and I in the Father (see: John 14:10). Thus, the Son is described as the radiance of glory and the exact representation of God’s nature (cf. Heb. 1:3), the image of the invisible God, the firstborn over all creation (cf. Col. 1:15). Birth, in this context, is not an abstract concept but a real, substantial event.