Romans 4:12-17

Verse 12

And the father of circumcision - He is also the head and representative of all the circumcision of all the Jews who walk in the steps of that faith; who seek for justification by faith only, and not by the works of the law; for this was the faith that Abraham had before he received circumcision. For, the covenant being made with Abraham while he was a Gentile, he became the representative of the Gentiles, and they primarily were included in that covenant, and the Jews were brought in only consequentially; but salvation, implying justification by faith, originally belonged to the Gentiles; and, when the Gospel came, they laid hold on this as their original right, having been granted to them by the free mercy of God in their father and representative, Abraham. So that the Jews, to be saved, must come under that Abrahamic covenant, in which the Gentiles are included. This is an unanswerable conclusion, and must, on this point, for ever confound the Jews.
Verse 13

For the promise, that he should be the heir of the world - This promise intimated that he should be the medium through whom the mercy of God should be communicated to the world, to both Jews and Gentiles; and the manner in which he was justified, be the rule and manner according to which all men should expect this blessing. Abraham is here represented as having all the world given to him as his inheritance; because in him all nations of the earth are blessed: this must therefore relate to their being all interested in the Abrahamic covenant; and every person, now that the covenant is fully explained, has the privilege of claiming justification through faith, by the blood of the Lamb, in virtue of this original grant.
Verse 14

For, if they which are of the law be heirs - If the Jews only be heirs of the promise made to Abraham, and that on the ground of prior obedience to the law, then faith is made void - is entirely useless; and the promise, which was made to faith, is made of none effect.
Verse 15

Because the law worketh wrath - For law νομος, any law, or rule of duty. No law makes provision for the exercise of mercy, for it worketh wrath, οργην, punishment, for the disobedient. Law necessarily subjects the transgressor to punishment; for where no law is - where no rule of duty is enacted and acknowledged, there is no transgression; and where there is no transgression there can be no punishment, for there is no law to enforce it. But the Jews have a law, which they have broken; and now they are exposed to the penal sanctions of that law; and, if the promises of pardon without the works of the law, do not extend to them, they must be finally miserable, because they have all broken the law, and the law exacts punishment. This was a home stroke, and the argument is unanswerable.
Verse 16

Therefore it is of faith, that it might be by grace - On this account the promise is mercifully grounded, not on obedience to a law, but on the infinite goodness of God: and thus the promise is sure to all the seed - to all, both Jews and Gentiles, who, believing in Christ Jesus, have a right to all the blessings contained in the Abrahamic covenant. All the seed necessarily comprehends all mankind. Of the Gentiles there can be no doubt, for the promise was given to Abraham while he was a Gentile; and the salvation of the Jews may be inferred, because they all sprang from him after he became an heir of the righteousness or justification which is received by faith; for he is the father of us all, both Jews and Gentiles. Dr. Taylor has an excellent note on this verse. "Here," says he, "it should be well observed that faith and grace do mutually and necessarily infer each other. For the grace and favor of God, in its own nature, requires faith in us; and faith on our part, in its own nature, supposes the grace or favor of God. If any blessing is the gift of God, in order to influence our temper and behavior, then, in the very nature of things, it is necessary that we be sensible of this blessing, and persuaded of the grace of God that bestows it; otherwise it is not possible we should improve it. On the other hand, if faith in the goodness of God, with regard to any blessing, is the principle of our religious hopes and action, then it follows that the blessing is not due in strict justice, nor on the foot of law, but that it is the free gift of Divine goodness. If the promise to Abraham and his seed be of faith on their part, then it is of grace on the part of God. And it is of faith, that it might be by grace: grace, being the mere good will of the donor, is free and open to all whom he chooses to make the objects of it: and the Divine wisdom appointed faith to be the condition of the promise; because faith is, on our part, the most simple principle, bearing an exact correspondence to grace, and reaching as far as that can extend; that so the happy effects of the promise might extend far and wide, take in the largest compass, and be confined to no condition, but what is merely necessary in the nature of things."
Verse 17

As it is written, I have made thee a father - That Abraham's being a father of many nations has relation to the covenant of God made with him, may be seen, Gen 17:4, Gen 17:5 : Behold my covenant is with thee, and thou shalt be a father of many nations: neither shall thy name any more be called Abram; but thy name shall be Abraham, for a father of many nations have I made thee, i.e. he was constituted the head of many nations, the Gentile world, by virtue of the covenant, which God made then with him.

God, who quickeneth the dead, etc. - God is the most proper object of trust and dependence; for being almighty, eternal, and unchangeable, he can even raise the dead to life, and call those things which be not as though they were. He is the Creator, he gave being when there was none; he can as infallibly assure the existence of those things which are not, as if they were already actually in being. And, on this account, he can never fail of accomplishing whatsoever he has promised.
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