The apostle having just before been speaking of the promise made to Abraham, and representing that as the rule of our justification, and not the law, lest they should think he did too much derogate from the law, and render it altogether useless, he thence takes occasion to discourse of the design and tendency of it, and to acquaint us for what purposes it was given. It might be asked, “If that promise be sufficient for salvation, wherefore then serveth the law? Or, Why did God give the law by Moses?” To this he answers,

I. The law was added because of transgressions, Gal. 3:19. It was not designed to disannul the promise, and to establish a different way of justification from that which was settled by the promise; but it was added to it, annexed on purpose to be subservient to it, and it was so because of transgressions. The Israelites, though they were chosen to be God’s peculiar people, were sinners as well as others, and therefore the law was given to convince them of their sin, and of their obnoxiousness to the divine displeasure on the account of it; for by the law is the knowledge of sin (Rom. 3:20), and the law entered that sin might abound, Rom. 5:20. And it was also intended to restrain them from the commission of sin, to put an awe upon their minds, and be a curb upon their lusts, that they should not run into that excess of riot to which they were naturally inclined; and yet at the same time it was designed to direct them to the true and only way whereby sin was to be expiated, and wherein they might obtain the pardon of it; namely, through the death and sacrifice of Christ, which was the special use for which the law of sacrifices and purifications was given.

The apostle adds that the law was given for this purpose till the seed should come to whom the promise was made; that is, either till Christ should come (the principle seed referred to in the promise, as he had before shown), or till the gospel dispensation should take place, when Jews and Gentiles, without distinction, should, upon believing, become the seed of Abraham. The law was added because of transgressions, till this fulness of time, or this complete dispensation, should come. But when the seed came, and a fuller discovery of divine grace in the promise was made, then the law, as given by Moses, was to cease; that covenant, being found faulty, was to give place to another, and a better, Heb. 8:7, 8. And though the law, considered as the law of nature, is always in force, and still continues to be of use to convince men of sin and to restrain them from it, yet we are now no longer under the bondage and terror of that legal covenant. The law then was not intended to discover another way of justification, different from that revealed by the promise, but only to lead men to see their need of the promise, by showing them the sinfulness of sin, and to point them to Christ, through whom alone they could be pardoned and justified.

As a further proof that the law was not designed to vacate the promise, the apostle adds, It was ordained by angels in the hand of a mediator. It was given to different persons, and in a different manner from the promise, and therefore for different purposes. The promise was made to Abraham, and all his spiritual seed, including believers of all nations, even of the Gentiles as well as the Jews; but the law was given to the Israelites as a peculiar people, and separated from the rest of the world. And, whereas the promise was given immediately by God himself, the law was given by the ministry of angels, and the hand of a mediator. Hence it appeared that the law could not be designed to set aside the promise; for (Gal. 3:20), A mediator is not a mediator of one, of one party only; but God is one, but one party in the promise or covenant made with Abraham: and therefore it is not to be supposed that by a transaction which passed only between him and the nation of the Jews he should make void a promise which he had long before made to Abraham and all his spiritual seed, whether Jews or Gentiles. This would not have been consistent with his wisdom, nor with his truth and faithfulness. Moses was only a mediator between God and the spiritual seed of Abraham; and therefore the law that was given by him could not affect the promise made to them, much less be subversive of it.

II. The law was given to convince men of the necessity of a Saviour. The apostle asks (Gal. 3:21), as what some might be willing to object, “Isa. the law then against the promises of God? Do they really clash and interfere with each other? Or do you not set the covenant with Abraham, and the law of Moses, at variance with one another?” To this he answers, God forbid; he was far from entertaining such a thought, nor could it be inferred from what he had said. The law is by no means inconsistent with the promise, but subservient to it, as the design of it is to discover men’s transgressions, and to show them the need they have of a better righteousness than that of the law. That consequence would much rather follow from their doctrine than from his; for, if there had been a law given that could have given life, verily righteousness would have been by the law, and in that case the promise would have been superseded and rendered useless. But that in our present state could not be, for the scripture hath concluded all under sin (Gal. 3:22), or declared that all, both Jew and Gentile, are in a state of guilt, and therefore unable to attain to righteousness and justification by the works of the law. The law discovered their wounds, but could not afford them a remedy: it showed that they were guilty, because it appointed sacrifices and purifications, which were manifestly insufficient to take away sin: and therefore the great design of it 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.

III. The law was designed for a schoolmaster, to bring men to Christ, Gal. 3:24. In the Gal. 3:23; the apostle acquaints us with the state of the Jews under the Mosaic economy, that before faith came, or before Christ appeared and the doctrine of justification by faith in him was more fully discovered, they were kept under the law, obliged, under severe penalties, to a strict observance of the various precepts of it; and at that time they were shut up, held under the terror and discipline of it, as prisoners in a state of confinement: the design of this was that hereby they might be disposed more readily to embrace the faith which should afterwards be revealed, or be persuaded to accept Christ when he came into the world, and to fall in with that better dispensation he was to introduce, whereby they were to be freed from bondage and servitude, and brought into a state of greater light and liberty. Now, in that state, he tells them, the law was their schoolmaster, to bring them to Christ, that they might be justified by faith. As it declared the mind and will of God concerning them, and at the same time denounced a curse against them for every failure in their duty, so it was proper to convince them of their lost and undone condition in themselves, and to let them see the weakness and insufficiency of their own righteousness to recommend them to God. And as it obliged them to a variety of sacrifices, etc., which, though they could not of themselves take away sin, were typical of Christ, and of the great sacrifice which he was to offer up for the expiation of it, so it directed them (though in a more dark and obscure manner) to him as their only relief and refuge. And thus it was their schoolmaster, to instruct and govern them in their state of minority, or, as the word paidagogos most properly signifies, their servant, to lead and conduct them to Christ (as children were wont to be led to school by those servants who had the care of them); that they might be more fully instructed by him as their schoolmaster, in the true way of justification and salvation, which is only by faith in him, and of which he was appointed to give the fullest and clearest discoveries. But lest it should be said, If the law was of this use and service under the Jewish, why may it not continue to be so under the Christian state too, the apostle adds (Gal. 3:25) that after faith has come, and the gospel dispensation has taken place, under which Christ, and the way of pardon and life through faith in him, are set in the clearest light, we are no longer under a schoolmaster—we have no such need of the law to direct us to him as there was then. Thus the apostle acquaints us for what uses and purposes the law served; and, from what he says concerning this matter, we may observe,

1. The goodness of God to his people of old, in giving the law to them; for though, in comparison of the gospel state, it was a dispensation of darkness and terror, yet it furnished them with sufficient means and helps both to direct them in their duty to God and to encourage their hopes in him.

2. The great fault and folly of the Jews, in mistaking the design of the law, and abusing it to a very different purpose from that which God intended in the giving of it; for they expected to be justified by the works of it, whereas it was never designed to be the rule of their justification, but only a means of convincing them of their guilt and of their need of a Saviour, and of directing them to Christ, and faith in him, as the only way of obtaining this privilege. See Rom. 9:31, 32; 10:3, 4.

3. The great advantage of the gospel state above the legal, under which we not only enjoy a clearer discovery of divine grace and mercy than was afforded to the Jews of old, but are also freed from the state of bondage and terror under which they were held. We are not now treated as children in a state of minority, but as sons grown up to a full age, who are admitted to greater freedoms, and instated in larger privileges, than they were. This the apostle enlarges upon in the Gal. 3:26-29. For, having shown for what intent the law was given, in the close of the chapter he acquaints us with our privilege by Christ, where he particularly declares,

(1.) That we are the children of God by faith in Christ Jesus, Gal. 3:26. And here we may observe, [1.] The great and excellent privilege which real Christians enjoy under the gospel: They are the children of God; they are no longer accounted servants, but sons; they are not now kept at such a distance, and under such restraints, as the Jews were, but are allowed a nearer and freer access to God than was granted to them; yea, they are admitted into the number, and have a right to all the privileges, of his children. [2.] How they come to obtain this privilege, and that is by faith in Christ Jesus. Having accepted him as their Lord and Saviour, and relying on him alone for justification and salvation, they are hereupon admitted into this happy relation to God, and are entitled to the privileges of it; for (John 1:12) as many as received him, to them gave he power to become the sons of God, even to those that believe on his name. And this faith in Christ, whereby they became the children of God, he reminds us (Gal. 3:27), was what they professed in baptism; for he adds, As many of you as have been baptized into Christ have put on Christ. Having in baptism professed their faith in him, they were thereby devoted to him, and had, as it were, put on his livery, and declared themselves to be his servants and disciples; and having thus become the members of Christ, they were through him owned and accounted as the children of God. Here note, First, Baptism is now the solemn rite of our admission into the Christian church, as circumcision was into that of the Jews. Our Lord Jesus appointed it to be so, in the commission he gave to his apostles (Matt. 28:19), and accordingly it was their practice to baptize those whom they had discipled to the Christian faith; and perhaps the apostle might take notice of their baptism here, and of their becoming the children of God through faith in Christ, professed therein, to obviate a further objection, which the false teachers might be apt to urge in favour of circumcision. They might be ready to say, “Though it should be allowed that the law, as given at mount Sinai, was abrogated by the coming of Christ the promised seed, yet why should circumcision be set aside too, when that was given to Abraham together with the promise, and long before the giving of the law by Moses?” But this difficulty is sufficiently removed when the apostle says, Those who are baptized into Christ have put on Christ; for thence it appears that under the gospel baptism comes in the room of circumcision, and that those who by baptism are devoted to Christ, and do sincerely believe in him, are to all intents and purposes as much admitted into the privileges of the Christian state as the Jews were by circumcision into those of the legal (Phil. 3:3), and therefore there was no reason why the use of that should still be continued. Note, Secondly, In our baptism we put on Christ; therein we profess our discipleship to him, and are obliged to behave ourselves as his faithful servants. Being baptized into Christ, we are baptized into his death, that as he died and rose again, so, in conformity thereunto, we should die unto sin, and walk in newness of life (Rom. 6:3, 4); it would be of great advantage to us did we oftener remember this.

(2.) That this privilege of being the children of God, and of being by baptism devoted to Christ, is now enjoyed in common by all real Christians. The law indeed made a difference between Jew and Greek, giving the Jews on many accounts the pre-eminence: that also made a difference between bond and free, master and servant, and between male and female, the males being circumcised. But it is not so now; they all stand on the same level, and are all one in Christ Jesus; as the one is not accepted on the account of any national or personal advantages he may enjoy above the other, so neither is the other rejected for the want of them; but all who sincerely believe on Christ, of what nation, or sex, or condition, soever they be, are accepted of him, and become the children of God through faith in him.

(3.) That, being Christ’s, we are Abraham’s seed, and heirs according to the promise. Their judaizing teachers would have them believe that they must be circumcised and keep the law of Moses, or they could not be saved: “No,” says the apostle, “there is no need of that; for if you be Christ’s, if you sincerely believe on him, who is the promised seed, in whom all the nations of the earth were to be blessed, you therefore become the true seed of Abraham, the father of the faithful, and as such are heirs according to the promise, and consequently are entitled to the great blessings and privileges of it.” And therefore upon the whole, since it appeared that justification was not to be attained by the works of the law, but only by faith in Christ, and that the law of Moses was a temporary institution and was given for such purposes as were only subservient to and not subversive of the promise, and that now, under the gospel, Christians enjoy much greater and better privileges than the Jews did under that dispensation, it must needs follow that they were very unreasonable and unwise, in hearkening to those who at once endeavoured to deprive them of the truth and liberty of the gospel.