‘But when the completion of the season had come, God sent away His son, having come into being from out of a woman, having come into being under law, 5 in order that he buy back those under law, in order that we receive placing as a son. 6 And because you are sons, God sends forth the Breath of His Son penetrating into our hearts, our deep inner core, crying aloud and shrieking ‘Abba, Father!’. 7 So therefore, you are no longer existing a slave, but if a son by means of God, also an heir, allotted a share. 8 But indeed, at that time, absolutely not knowing God, you were the enslaved by nature, lest being gods’, (Galatians 4 v 4 - 8).
Paul has just said that Jews existed like under-age heirs, enslaved under the orderly system of rudimentary elements and first principles of the Sinai Covenant with its written codes of law, until the time appointed by the Father. That season of under-age enslavement of Jews was completed when ‘God sent away His son’. The only-begotten Son pre-existed his ‘coming into being from out of a woman’. Indeed, the Son of God is ‘the image of the invisible God, firstborn of the whole in terms of the individual parts of what is originally formed’, (Colossians 1 v 15). ‘By means of him all came into being, and apart from him, not even one was caused to be that has come into being’, (John 1 v 3). Thus ‘God sent away His son’ from out of the heavenly realm to ‘come into being from out of a woman, having come into being under law’. God’s purpose was ‘that [His son] buy back those under law, in order that we receive placing as a son'. The details of this forms the details of the gospel or ‘good news’ of course. But Paul is not interested here in explaining the gospel in detail. He is interested to present the concept of ‘sonship’, because ‘if children, also heirs, indeed, God’s heirs, and fellow-heirs with the Messiah’, (Romans 8 v 17).
But there is more, ‘because you are sons, God sends forth the Breath of His Son penetrating into our hearts, our deep inner core’. Over the course of his writings, Paul places two pairs of principles that are in opposition to one another -
Covenant Law vs God’s Promise (Galatians)
Fleshly impulses towards death vs Breath penetrating into Life (Romans 7, 8)
The Breath of the Messiah penetrating within the Christian’s heart, including the heart or deep inner core of Hebrew Christians, is ‘crying aloud and shrieking ‘Abba, Father!’.
Paul then reaches his conclusion in verses 7 and 8. ‘So therefore, you are no longer existing a slave, but if a son by means of God, also an heir, allotted a share. 8 But indeed, at that time, absolutely not knowing God, you were the enslaved by nature, lest being gods’
Paul’s conclusion is that Jews who are entrusting the Messiah are adopted sons and fellow heirs with the Messiah as a result of God fulfilling His promises through giving His only-begotten son and His Breath. Hebrew Christians are no longer enslaved to Covenant law, and no longer ‘the enslaved by nature’, by the impulses of their flesh. Why? Because of the opposing impetus and movement of the Breath of God within them in their deepest inner core. But previously, before entrusting the Messiah, Jews were enslaved, by their own human nature. Paul then adds sarcastically, ‘lest being gods’ – unless you Jews were gods with superhuman ability and strength.