27. For it is written. The apostle proves, by a quotation from Isaiah, that the lawful sons of the Church are born according to the promise. The passage is in Isaiah 54 where the prophet speaks of the kingdom of Christ and the calling of the Gentiles, and promises to the barren wife and the widow a numerous offspring; for it is on this ground that he exhorts the Church to "sing" and "rejoice." The design of the apostle, let it be carefully remarked, is to deprive the Jews of all claim to that spiritual Jerusalem to which the prophecy relates. Isaiah proclaims, that her children shall be gathered out of all the nations of the earth, and not by any preparation of hers, but by the free grace and blessing of God.

He next concludes that we become the sons of God by promise, after the example (kata< jIsaa<k) of Isaac, and that in no other way do we obtain this honor. To readers little skilled or practiced in the examination of Scripture, this reasoning may appear inconclusive; because they do not hold the most undoubted of all principles, that all the promises, being founded on the Messiah, are of free grace. It was because the apostle took this for granted, that he so fearlessly contrasted the promise with the law.

29. As then, he that was born after the flesh. He denounces the cruelty of the false apostles, who wantonly insulted pious persons that placed all their confidence in Christ. There was abundant need that the uneasiness of the oppressed should be soothed by consolation, and that the cruelty of their oppressors should be severely checked. It is not wonderful, he says, that the children of the law, at the present day, do what Ishmael their father at first did, who, trusting to his being the first-born, persecuted Isaac the true heir. With the same proud disdain do his posterity now, on account of outward ceremonies, circumcision, and the various services of the law, molest and vaunt over the lawful sons of God. The Spirit is again contrasted with the flesh, that is, the calling of God with human appearance. (1 Samuel 16:7.) So the disguise is admitted to be possessed by the followers of the Law and of works, but the reality is claimed for those who rely on the calling of God alone, and depend upon his grace.

Persecuted. But persecution is nowhere mentioned, only Moses says that Ishmael was qhum, (metzahek,) mocking, (Genesis 21:9;) and by this participle he intimates that Ishmael ridiculed his brother Isaac. The explanation offered by some Jews, that this was a simple smile, is entirely inadmissible; for what cruelty would it have argued, that a harmless smile should have been so fearfully revenged? There cannot then be a doubt that he maliciously endeavored to provoke the child Isaac by reproachful language.

But how widely distant is this from persecution? ¹ And yet it is not idly or unguardedly that Paul enlarges on this point. No persecution ought to distress us so much as to see our calling attempted to be undermined by the reproaches of wicked men. Neither blows, nor scourging, nor nails, nor thorns, occasioned to our Lord such intense suffering as that blasphemy:

"He trusted in God; what availeth it to him?
for he is deprived of all assistance." (Matthew 27:43.)

There is more venom in this than in all persecutions; for how much more alarming is it that the grace of Divine adoption shall be made void, than that this frail life shall be taken from us? Ishmael did not persecute his brother with the sword; but, what is worse, he treated him with haughty disdain by trampling under foot the promise of God. All persecutions arise from this source, that wicked men despise and hate in the elect the grace of God; a memorable instance of which we have in the history of Cain and Abel. (Genesis 4:8.)

This reminds us, that not only ought we to be filled with horror at outward persecutions, when the enemies of religion slay us with fire and sword; when they banish, imprison, torture, or scourge; but when they attempt, by their blasphemies, to make void our confidence, which rests on the promises of God; when they ridicule our salvation, when they wantonly laugh to scorn the whole gospel. Nothing ought to wound our minds so deeply as contempt of God, and reproaches cast upon His grace: nor is there any kind of persecution more deadly than when the salvation of the soul is assailed. We who have escaped from the tyranny of the Pope, are not called to encounter the swords of wicked men. But how blind must we be, if we are not affected by that spiritual persecution, in which they strive, by every method, to extinguish that doctrine, from which we draw the breath of life! -- when they attack our faith by their blasphemies, and shake not a few of the less informed! For my own part, I am far more grieved by the fury of the Epicureans than of the Papists. They do not attack us by open violence; but, in proportion as the name of God is more dear to me than my own life, the diabolical conspiracy which I see in operation to extinguish all fear and worship of God, to root out the remembrance of Christ, or to abandon it to the jeers of the ungodly, cannot but rack my mind with greater anxiety, than if a whole country were burning in one conflagration:

30. But what saith the Scripture? There was some consolation in knowing that we do but share the lot of our father Isaac; but it is a still greater consolation, when he adds, that hypocrites, with all their boasting, can gain nothing more than to be cast out of the spiritual family of Abraham; and that, to whatever extent they may harass us for a time, the inheritance will certainly be ours. Let believers cheer themselves with this consolation, that the tyranny of the Ishmaelites will not last for ever. They appear to have reached the highest pre-eminence, and, proud of their birthright, look down upon us with contempt; but they will one day be declared to be the descendants of Hagar, the sons of a slave, and unworthy of the inheritance.

Let us be instructed by this beautiful passage,

"not to fret ourselves because of evil-doers,
neither be envious against the workers of iniquity,"
(Psalm 37:1,)

when they hold a temporary habitation and rank in the Church, but patiently to look for the end which awaits them. There are many pretended Christians, or strangers, who hold a place in the Church, but who afterwards give evidence of their departure from the faith, as he who, proud of his birthright, at first reigned, was cast out like a foreigner with the posterity of Ishmael. Some censorious persons smile at Paul's simplicity, in comparing a woman's passion, arising out of a trifling quarrel, to a judgment of God. But they overlook the decree of God, which took effect in such a manner, as to make it manifest that the whole transaction was directed by a heavenly providence. That Abraham should have been commanded to humor his wife (Genesis 21:12) entirely in the matter, is no doubt extraordinary, but proves that God employed the services of Sarah for confirming his own promise. In a word, the casting out of Ishmael was nothing else than the consequence and the accomplishment of that promise, "In Isaac shall thy seed be called," (Genesis 21:12,) -- not in Ishmael. Although, therefore, it was the revenging of a woman's quarrel, yet God did not the less make known his sentence by her mouth as a type of the Church.

31. So then, brethren. He now exhorts the Galatians to prefer the condition of the children of Sarah to that of the children of Hagar; and having reminded them that, by the grace of Christ, they were born to freedom, he desires them to continue in the same condition. If we shall call the Papists, Ishmaelites and Hagarites, and boast that we are the lawful children, they will smile at us; but if the two subjects in dispute be fairly compared, the most ignorant person will be at no loss to decide.