15 Brethren , I speak in terms of human relations : even though it is only a man's covenant , yet when it has been ratified , no one sets it aside or adds conditions to it. 16 Now the promises were spoken to Abraham and to his seed . He does not say , "And to seeds ," as referring to many , but rather to one , " And to your seed ," that is, Christ . 17 What I am saying is this : the Law , which came four hundred and thirty years later , does not invalidate a covenant previously ratified by God , so as to nullify the promise . 18 For if the inheritance is based on law , it is no longer based on a promise ; but God has granted it to Abraham by means of a promise .
19 Why the Law then ? It was added because of transgressions , having been ordained through angels by the agency of a mediator , until the seed would come to whom the promise had been made . 20 Now a mediator is not for one party only; whereas God is only one . 21 Is the Law then contrary to the promises of God ? May it never be! For if a law had been given which was able to impart life , then righteousness would indeed have been based on law . 22 But the Scripture has shut up everyone under sin , so that the promise by faith in Jesus Christ might be given to those who believe .
Matthew Henry's Commentary on Galatians 3:15-22
Commentary on Galatians 3:15-18
(Read Galatians 3:15-18)
The covenant God made with Abraham, was not done away by the giving the law to Moses. The covenant was made with Abraham and his Seed. It is still in force; Christ abideth for ever in his person, and his spiritual seed, who are his by faith. By this we learn the difference between the promises of the law and those of the gospel. The promises of the law are made to the person of every man; the promises of the gospel are first made to Christ, then by him to those who are by faith ingrafted into Christ. Rightly to divide the word of truth, a great difference must be put between the promise and the law, as to the inward affections, and the whole practice of life. When the promise is mingled with the law, it is made nothing but the law. Let Christ be always before our eyes, as a sure argument for the defence of faith, against dependence on human righteousness.
Commentary on Galatians 3:19-22
(Read Galatians 3:19-22)
If that promise was enough for salvation, wherefore then serveth the law? The Israelites, though chosen to be God's peculiar people, were sinners as well as others. The law was not intended to discover a way of justification, different from that made known by the promise, but to lead men to see their need of the promise, by showing the sinfulness of sin, and to point to Christ, through whom alone they could be pardoned and justified. The promise was given by God himself; the law was given by the ministry of angels, and the hand of a mediator, even Moses. Hence the law could not be designed to set aside the promise. A mediator, as the very term signifies, is a friend that comes between two parties, and is not to act merely with and for one of them. The great design of the law was, that the promise by faith of Jesus Christ, might be given to those that believe; that, being convinced of their guilt, and the insufficiency of the law to effect a righteousness for them, they might be persuaded to believe on Christ, and so obtain the benefit of the promise. And it is not possible that the holy, just, and good law of God, the standard of duty to all, should be contrary to the gospel of Christ. It tends every way to promote it.