To see it, one must insert several explanatory thoughts. Having clarified the significance of the law, the holy Apostle said just before this: we Jews are no longer under the tutor now that faith has come, the New Covenant dispensation of salvation.
The tutor did his work. He brought us to faith, by which we were justified. We became inwardly upright by the action of the grace of the Holy Spirit, in Whom lies the power of the promise to Abraham.
The Gentiles, apart from the law, cleaved directly to the Lord by faith and were counted worthy of the same promised good. I now turn to you, Galatians, who have received my preaching of salvation in the Lord Jesus Christ by the grace of the Holy Spirit.
Do you not see that all of you, both Jews and Gentiles, have equally become sons of God by faith in Christ Jesus? All of you have equally become Christ’s.
If you are Christ’s, then you are Abraham’s seed and heirs according to the promise. That is, you are Abraham’s heirs, or heirs of the blessings promised to Abraham, according to the spirit of the promise itself.
From this it followed of itself that you already have everything through faith alone. There is no reason for you to bind yourselves any longer to the law, or to bind yourselves by it without any benefit.
Such is the content of this concluding section (Gal 3:26-29). The discourse itself presents no difficulties for understanding. But since it touches the most essential side of the work of ordering our salvation, it is by no means superfluous to interpret it.
“All of you are sons of God,” says the Apostle. According to the form of the ordering of our salvation, sonship to God is so essential in the work of salvation that it cannot fail to be present.
For the chief thing here is birth from God according to the image of the One Who created, that is, the Lord Jesus Christ. Therefore the Evangelist John writes: “As many as received Him,” the Word made flesh, “to them He gave power to become children of God, to those who believe in His name. They were born not of blood, nor of the will of the flesh, nor of the will of man, but of God” (cf. Jn 1:12-13).
Without this new birth there is no salvation. “Unless one is born of water and the Spirit, he cannot enter the Kingdom of God” (cf. Jn 3:5). Those born of God in this way are, of course, by that very fact sons of God.
This is accomplished by the grace of the Holy Spirit, under the condition of faith in Christ Jesus. Therefore the Apostle says: you are sons of God by faith, which is in Christ Jesus.
Appearing among communities that did not know Christ the Lord, the Apostles instructed them with the good tidings. They said: we all sinned in our forefather and came under God’s wrath.
God showed His mercy to us by arranging salvation for us in His Only-begotten Son. He, having become incarnate, blotted out our sins by His death. Having ascended into heaven, He sent down the Holy Spirit.
When He is received in the mysteries by believers, He puts sin itself to death in them and gives them new life.
When those who heard inclined toward faith in the good tidings, it was said to them by the word of the Apostle Peter: “Repent, and let each of you be baptized in the name of Jesus Christ for the remission of sins, and you shall receive the gift of the Holy Spirit” (cf. Acts 2:38).
Those who did this were born from God into new life. And behold, they are sons of God. Saint Paul, explaining how those to whom he wrote are all sons of God, says: