In these two short phrases, Paul begins to reflect on the circumstances of Jesus’ birth, and they in turn move us to ponder the humiliation of Him who is from all eternity the glorious Son of God.
But when the fullness of time had come, God sent forth his Son, born of woman, born under the law, to redeem those who were under the law, so that we might receive adoption as sons (Galatians 4:4-5).
In his phrase when the fullness of time had come, the Apostle Paul points us to the truth that the one true God has been orchestrating all of history and, in particular, the timing of Christ’s birth. In fact, it was by God’s singular sovereignty and providence that the histories of Rome and Jerusalem—even that of little Bethlehem—had coincided at the birth of Jesus. The appointed date for the debut of the Son of the Father occurred right on schedule, and He became the Child born at just the right time. And that’s not all. Paul has more to say in Gal 4:4.
He tells us that the Child in the manger was the Son sent forth by His Father. These simple words take us to the backstory of the Son’s arrival in history. Notice that the Son existed before He was sent, before He was born, before He was given the name Jesus. Before His Father sent Him, He subsisted as a Person and, at that, as a Person distinct from both the Father and the Spirit, the latter of whom was Himself later to be sent (Gal 4:6). In effect, Paul would tell us that the Son was (and is) the same in substance and equal in power and glory with the Father and the Spirit, yet was also distinguished from them by their personal properties. Notice too that the Father sent forth (sent out) His Son. That is, the Son who came had a commission from His Father. We speak of the Great Commission, but here Paul speaks of the Greatest Commission of all. He reflects on the harmony between the sending Father and the sent Son. The Father was pleased to send the Son; the Son was pleased to be sent by His Father. According to the Apostle, then, the Baby in the feeding trough was none other than God with God, the Son with the Father and the Spirit, the Son commissioned by His Father.