By faith we are rescued from the Law and become sons of God

^23-25 Before the coming of faith we were all imprisoned under the power of the Law, with our only hope of deliverance the faith that was to be shown to us. Or, to change the metaphor, the Law was like a strict governess in charge of us until we went to the school of Christ and learned to be justified by faith in him. Once we had that faith we were completely free from the governess’s authority.

^26-29 For now that you have faith in Christ you are all sons of God. All of you who were baptised “into” Christ have put on the family likeness of Christ. Gone is the distinction between Jew and Greek, slave and free man, male and female—you are all one in Christ Jesus. And if you belong to Christ, you are true descendants of Abraham, you are true heirs of his promise.

4 ^1-7 But you must realise that so long as an heir is a child, though he is destined to be master of everything, he is, in practice, no different from a servant. He has to obey a guardian or trustee until the time which his father has chosen for him to receive his inheritance. So is it with us: while we were “children” we lived under the authority of basic moral principles. But when the proper time came God sent his son, born of a human mother and born under the jurisdiction of the Law, that he might redeem those who were under the authority of the Law and lead us into becoming, by adoption, true sons of God. It is because you really are his sons that God has sent the Spirit of his Son into your hearts to cry “Father, dear Father”. You, my brother, are not a servant any longer; you are a son. And, if you are a son, then you are certainly an heir of God through Christ.

Consider your own progress: do you want to go backwards

^8-11 At one time when you had no knowledge of God, you were under the authority of gods who had no real existence. But now that you have come to know God, or rather are known by him, how can you revert to dead and sterile principles and consent to be under their power all over again? Your religion is beginning to be a matter of observing certain days or months or seasons or years. Frankly, you stagger me, you make me wonder if all my efforts over you have been wasted!