Whose goings forth are from of old, from…
Whose goings forth are from of old, from everlasting.
Although the Newborn is a human being of flesh and blood, as all of us, His nonetheless the Divine Newborn. He joined in himself both the human and divine natures, hence we say in the Creed that He is Begotten not Created.
Jesus is the same Pre-eternal Word of God born of the Father before all ages and born of Our Lady the Virgin Mary according into humanity. The Word became human without any change in its divine nature, and assumed all human nature, except sin, because sin is originally alien to humans.
He has two natures: the divine and the human, each being of perfect attributes in His one person (hypostasis).
Christ is on hypostasis in two distinct natures: the human and the divine, as confirmed by the Church in the Ecumenical Councils by the Holy Spirit through the Holy Fahers.
For example, we read in the Council of Chalcedon, 451.
“Chirst is the same perfect in Godhead and also perfect in manhood; truly God and truly man; consubstantial with the Father according to the Godhead, and consubstantial with us according to the Manhood; in all things like unto us, without sin; begotten before all ages of the Father according to the Godhead, and in these latter days, for us and for our salvation, born of the Virgin Mary, the Mother of God, according to the Manhood; one and the same Christ, Son, Lord, only begotten, to be acknowledged in two natures, inconfusedly, unchangeably, indivisibly, inseparably; (ἐν δύο φύσεσιν ἀσυγχύτως, ἀτρέπτως, ἀδιαιρέτως, ἀχωρίστως – in duabus naturis inconfuse, immutabiliter, indivise, inseparabiliter). Not parted or divided into two persons, but one and the same Son, and only begotten God (μονογενῆ Θεόν), the Word, the Lord Jesus Christ”.