For ye are all the children of God by faith in Christ Jesus.
26. For ye are all the children of God. It would be unjust, and in the highest degree unreasonable, that the law should hold believers in perpetual slavery. This is proved by the additional argument, that they are the children of God. It would not be enough to say that we are no longer children, unless it were added that we are freemen; for in slaves age makes no alteration.
The law was given to convince men of sin and to restrain them from running into excess. It was never meant to overthrow the promise, but to serve it by directing sinners to Christ, the only way sin is expiated and pardoned.
AI summary
Commenting on Galatians 3:19-29
For ye are all the children of God,.... Not by nature, as Christ is the Son of God, for he is the only begotten of the Father, and in such sense as neither angels nor men are the sons of God; nor by creation, as Adam and all mankind, and the angels are; but by divine adoption by an act of God's rich and sovereign...