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 fact of their being the children of God proves their freedom. How? By faith in Christ Jesus; for "as many as received him, to them gave he power to become the sons of God, even to them that believe on his name." (John 1:12.) Since, then, by faith we have obtained adoption, by faith likewise we have obtained our freedom.

For ye are all the children of God - All who bear the Christian name - the converts from among the Jews and Gentiles alike; see the note at John 1:12. The idea here is, that they are no longer under tutors and governors; they are no longer subject to the direction and will of the "paedagogus"; they are arrived at age, and are admitted to the privileges of sons; see the note at Galatians 4:1. The language here is derived from the fact, that until the son arrived at age, he was in many respects not different from a servant. He was under laws and restraints; and subject to the will of another. When of age, he entered on the privileges of heirship, and was free to act for himself. Thus, under the Law, people were under restraints, and subject to heavy exactions. Under the gospel, they are free, and admitted to the privileges of the sons of God.

For ye, who have believed the Gospel, are all the children of God by faith in Christ Jesus - But no man is a child of God by circumcision, nor by any observance of the Mosaic law.

(27) For ye are all the children of God by faith in Christ Jesus.
(27) Because age does not change the condition of servants, he adds that we are free by condition, and therefore, seeing we are out of our childhood, we have no more need of a keeper and schoolmaster.

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 grace, putting them among the children in saying this the apostle directs himself to the Gentiles for their comfort, and says this of them all in a judgment of charity, they being under a profession of faith; lest they should think, because they were not Abraham's seed according to the flesh, nor were ever trained up under the law as a schoolmaster, that they were not the children of God: whereas they were such not by the law, as none indeed are,
but by faith in Christ Jesus; not that faith makes any the children of God, or puts them into such a relation; no, that is God's own act and deed; of his free rich grace and goodness, God the Father has predestinated his chosen ones to the adoption of children, and has secured and laid up this blessing for them in the covenant of grace; Christ by redemption has made way for their reception and enjoyment of it; the Spirit of God, in consequence of their sonship, as a spirit of adoption bears strong reason and argument, proving that they are not under the law as a schoolmaster, in which light it is here set by the apostle; since they are sons and not servants, and so free from the bondage of the law; they are sons grown up into the faith of Christ, and are led and taught by the Spirit of God, as they are that are the children of God by faith; and as is promised to the saints under the Gospel, that they shall be "all taught of God"; and therefore stood in no need of the law as a schoolmaster, which only was concerned with the Jews, whilst they were children under age; and has nothing to do with such, whether Jews or Gentiles, who believe in Christ, and are growing up into him their head, till they come to the measure of the stature of the fulness of him.

Real Christians enjoy great privileges under the gospel; and are no longer accounted servants, but sons; not now kept at such a distance, and under such restraints as the Jews were. Having accepted Christ Jesus as their Lord and Saviour, and relying on him alone for justification and salvation, they become the sons of God. But no outward forms or profession can secure these blessings; for if any man have not the Spirit of Christ, he is none of his. In baptism we put on Christ; therein we profess to be his disciples. Being baptized into Christ, we are baptized into his death, that as he died and rose again, so we should die unto sin, and walk in newness and holiness of life. The putting on of Christ according to the gospel, consists not in outward imitation, but in a new birth, an entire change. He who makes believers to be heirs, will provide for them. Therefore our care must be to do the duties that belong to us, and all other cares we must cast upon God. And our special care must be for heaven; the things of this life are but trifles. The city of God in heaven, is the portion or child's part. Seek to be sure of that above all things.

children--Greek, "sons."
by--Greek, "through faith." "Ye all" (Jews and Gentiles alike) are no longer "children" requiring a tutor, but SONS emancipated and walking at liberty.

For ye - Christians. Are all adult sons of God - And so need a schoolmaster no longer.