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10. I will certainly return unto thee Jerome translates its ‘I will return, life attending me:’^{411411     “}Vita comite revertar.” See Vulgate, where the expression is “Revertens veniam ad to tempore illo, vita comite.” as if God, speaking in the manner of men, had said, ‘I will return if I live.’ But it would be absurd, that God, who here so magnificently proclaims his power, should borrow from man a form of speech which would suppose him to be mortal. What majesty, I pray, would this remarkable oracle possess, which treats of the eternal salvation of the world? That interpretation, therefore, can by no means be approved, which entirely enervates the force and authority of the promise. Literally it is, according to the time of life. Which some expound of Sarah; as if the angel had said, Sarah shall survive to that period. But it is more properly explained of the child; for God promises that He will come, at the just and proper time of bringing forth, that Sarah might become the mother of a living child.

11. Were old, and well stricken in age Moses inserts this verse to inform us that what the angel was saying, justly appeared improbable to Sarah. For it is contrary to nature that children should be promised to decrepit old men. A doubt, however, may be entertained on this point, respecting Abraham: because men are sometimes endued with strength to have children, even in extreme old age: and especially in that period, such an occurrence was not uncommon. But Moses here speaks comparatively: for since Abraham, during the vigor of his life, had remained with his wife childless; it was scarcely possible for him, now that his body was half dead, to have children; he had indeed begotten Ishmael in his old age, which was contrary to expectation. But that now, twelve years afterwards, it should be possible to become a father, through his aged wife,^{412412     “}Patrem ex vetula effoetaque muliere fieri posse.” was scarcely credible. Moses however chiefly insists upon the case of Sarah; because the greatest impediment was with her. It ceased, he says, to be with Sarah after the manner of women.⁴¹³⁴¹³     The following passage is not translated: — “Quo genere loquendi verecunde menses notat qui mulieribus fluunt. Una autem cum fluxu menstruo desinit concipiendi facultas.” With this expression, he soberly speaks about the monthly stream of the women. At the same moment with this, the possibility of conceiving ceases.

12. Therefore Sarah laughed within herself Abraham had laughed before, as appears in the preceding chapter Genesis 17:1: but the laughter of both was, by no means, similar. For Sarah is not transported with admiration and joy, on receiving the promise of God; but foolishly sets her own age and that of her husband in opposition to the word of God; that she may withhold confidence from God, when he speaks. Yet she does not, avowedly, charge God with falsehood or vanity; but because, having her mind fixed on the contemplation of the thing proposed, she only weighs what might be accomplished by natural means, without raising her thoughts to the consideration of the power of God, and thus rashly casts discredit on God who speaks to her. Thus, as often as we measure the promises and the works of God, by our own reason, and by the laws of nature, we act reproachfully towards him, though we may intend nothing of the sort. For we do not pay him his due honor, except we regard every obstacle which presents itself in heaven and on earth, as placed under subjection to his word. But although the incredulity of Sarah is not to be excused; she, nevertheless, does not directly reject the favor of God; but is only so kept back by shame and modesty, that she does not altogether believe what she hears. Even her very words declare the greatest modesty; ‘After we are grown old shall we give ourselves up to lust?’ Wherefore, let us observe, that nothing was less in Sarah’s mind, than to make God a liar. But herein consisted in this alone, that, having fixed her thoughts too much on the accustomed order of nature, she did not give glory to God, by expecting from him a miracle which she was unable to conceive in her mind. We must here notice the admonition which the Apostle gathers from this passage, because Sarah here calls Abraham her lord. (1 Peter 3:6.) For he exhorts women, after her example, to be obedient and well-behaved towards their own husbands. Many women, indeed, without difficulty, give their husbands this title, when yet they do not scruple to bring them under rule, by their imperious pride: but the Apostle takes it for granted that Sarah testifies, from her heart, what she feels, respecting her husband: nor is it doubtful that she gave proof, by actual services, of the modesty which she had professed in words.