one contends that it is said of nothing else than circumcision, that in it the infant has broken the covenant of God because he is not circumcised, he must seek some method of explanation by which it may be understood without absurdity (such as this) that he has broken the covenant, because it has been broken in him although not by him. Yet in this case also it is to be observed that the soul of the infant, being guilty of no sin of neglect against itself, would perish unjustly, unless original sin rendered it obnoxious to punishment. 28. _Of the change of name in Abraham and Sarah, who received the gift of fecundity when they were incapable of regeneration owing to the barrenness of one, and the old age of both._ Now when a promise so great and clear was made to Abraham, in which it was so plainly said to him, "I have made thee a father of many nations, and I will increase thee exceedingly, and I will make nations of thee, and kings shall go forth of thee. And I will give thee a son of Sarah; and I will bless him, and he shall become nations, and kings of nations shall be of him,"[291]--a promise which we now see fulfilled in Christ,--from that time forward this couple are not called in Scripture, as formerly, Abram and Sarai, but Abraham and Sarah, as we have called them from the first, for every one does so now. The reason why the name of Abraham was changed is given: "For," He says, "I have made thee a father of many nations." This, then, is to be understood to be the meaning of _Abraham_; but _Abram_, as he was formerly called, means "exalted father." The reason of the change of Sarah's name is not given; but as those say who have written interpretations of the Hebrew names contained in these books, Sarah means "my princess," and Sarai "strength." Whence it is written in the Epistle to the Hebrews, "Through faith also Sarah herself received strength to conceive seed."[292] For both were old, as the Scripture testifies; but she was also barren, and had ceased to menstruate, so that she could no longer bear children even if she had not been barren. Further, if a woman is advanced in years, yet still retains the custom of women, she can bear children to a young man, but not to an old man, although that same old man can beget, but only of a young woman; as after Sarah's death Abraham could of Keturah, because he met with her in her lively age. This, then, is what the apostle mentions as wonderful, saying, besides, that Abraham's body was now dead;[293] because at that age he was no longer able to beget children of any woman who retained now only a small part of her natural vigour. Of course we must understand that his body was dead only to some purposes, not to all; for if it was so to all, it would no longer be the aged body of a living man, but the corpse of a dead one. Although that question, how Abraham begot children of Keturah, is usually solved in this way, that the gift of