John Calvin's Bible Commentary
Genesis 21:12
12.In all that Sarah hath said unto thee. I have just said that although God used the ministry of Sarah in so great a matter, it was yet possible that she might fail in her method of acting. He now commands Abraham to hearken unto his wife, not because he approves her disposition, but because he will have the work, of which he is Himself the Author, accomplished. And he thus shows that his designs are not to be subjected to any common rule, especially when the salvation of the Church is concerned. For he purposely inverts the accustomed order of nature, in order that he may prove himself to be the Author and the Perfecter of Isaac’s vocation. But because I have before declared, that this history is more profoundly considered by Paul, the sum of it is here briefly to be collected. In the first place, he says, that what is here read, was written allegorically: not that he wishes all histories, indiscriminately to be tortured to an allegorical sense, as Origin does; who by hunting everywhere for allegories, corrupts the whole Scripture; and others, too eagerly emulating his example, have extracted smoke out of light. And not only has the simplicity of Scripture been vitiated, but the faith has been almost subverted, and the door opened to many foolish dotings. The design of Paul was, to raise the minds of the pious to consider the secret work of God, in this history; as if he had said, What Moses relates concerning the house of Abraham, belongs to the spiritual kingdom of Christ; since, certainly, that house was a lively image of the Church. This, however, is the allegorical similitude which Paul commends. Whereas two sons were born to Abraham, the one by a handmaid, the other by a free woman; he infers, that there are two kinds of persons born in the Church; the faithful, whom God endues with the Spirit of adoption, that they may enjoy the inheritance; and hypocritical disciples, who feign themselves to be what they are not, and usurp, for a time, a name and place among the sons of God. He therefore teaches, that there are certain who are conceived and born in a servile manner; but others, as from a freeborn mother. He then proceeds to say, that the sons of Hagar are they who are generated by the servile doctrine of the Law; but that they who, having embraced, by faith, gratuitous adoption, are born through the doctrine of the Gospel, are the sons of the free woman. At length he descends to another similitudes in which he compares Hagar with mount Sinai, but Sarah with the heavenly Jerusalem. And although I here allude in few words to those things which my readers will find copiously expounded by me, in the fourth chapter to the Galatians Galatians 4:1; yet, in this short explanation, it is made perfectly clear what Paul designs to teach. We know that the true sons of God are born of the incorruptible seed of the word: but when the Spirit, which gives life to the doctrine of the Law and the Prophets, is taken away, and the dead letter alone remains, then that seed is so corrupted, that only adulterous sons are born in a state of slavery; yet because they are apparently born of the word of God, though corrupted, they are, in a sense, the sons of God. Meanwhile, none are lawful heirs, except those whom the Church brings forth into liberty, being conceived by the incorruptible seed of the gospel. I have said, however, that in these two persons is represented the perpetual condition of the Church. For hypocrites not only mingle with the sons of God in the Church, but despise them, and proudly appropriate to themselves all the rights and honors of the Church. And as Ishmael, inflated with the vain title of primogeniture, harassed his brother Isaac with his taunts; so these men, relying on their own splendor, reproachfully assail and ridicule the true faith of the simple: because, by arrogating all things to themselves, they leave nothing to the grace of God. Hence we are admonished, that none have a well-grounded confidence of salvation, but they who, being called freely, regard the mercy of God as their whole dignity. Again, the Spirit furnishes the consciences of the pious with strong and effective weapons against the ferociousness of those who, under a false pretext, boast that they are the Church. We see that it is no new thing, for persons who are nothing but hypocrites to occupy the chief place in the Church at God. Wherefore, while at this day, the Papists proudly exult, there is no reason why we should be disturbed by their empty and inflated boasts. As to their glorying in their long succession, it just means as much as if Ishmael were proclaiming himself the firstborn. It is, therefore necessary to discriminate between the true and the hypocritical Church. Paul describes a mark, which they are never able, with their cavils, to obliterate. For as large bottles are broken with a slight blast; so by this single word, all their glory is extinguished, ‘the sons of the handmaid shall not be eternal inheritors.’ In the meantime their insolence is to be patiently borne, so long as God shall loosen the rein to their tyranny. For the Apostles, formerly, were oppressed by the Jewish hypocrites of their age, with the same reproaches which these men now cast upon us. In the same way, Ishmael triumphed over Isaac, as if he had obtained the victory. Wherefore, we must not wonder, if our own age also has its Ishmaelites. But lest such indignity should break our spirits, let this consolation perpetually occur to us, that they who hold the preeminence in the Church, will not always remain within it.