Commentary on Genesis John Calvin
COMMENTARY ON GENESIS
18. And Abraham said unto God Abraham does not now wonder silently within himself, but pours forth his wish and prayer. His language, however, is that of a mind still perturbed and vacillating, O that (or I wish that) Ishmael might live! For, as if he did not dare to hope for all that God promises, he fixes his mind upon the son already born; not because he would reject the promise of fresh offspring, but because he was contented with the favor already received, provided the liberality of God should not extend further. He does not, then, reject what the Lord offers; but while he is prepared to embrace it, the expression, O that Ishmael! yet flows from him through the weakness of his flesh. Some think that Abraham spoke thus, because he was afraid for his firstborn. But there is no reason why we should suppose that Abraham was smitten with any such fear, as that God, in giving him another son, would take away the former, or as if the latter favor should absorb that which had preceded. The answer of God, which follows shortly after, refutes this interpretation. What I have said is more certain; namely, that Abraham prayed that the grace of God, in which he acquiesced, might be ratified and confirmed to him. Moreover, without reflection, he breaks forth into this wish, when, for very joy, he could scarcely believe what he had heard from the mouth of God. 'To live before Jehovah' is as much as, to be preserved in safety under his protection, or to be blessed by Him. Abraham therefore desires of the Lord, that he will preserve the life which he has given to Ishmael.
19. Sarah thy wife shall bear thee a son indeed Some take the adverbאבל (abal,) to mean 'Truly.' Others, however, more rightly suppose it to be used for increasing the force of the expression. For God rouses the slumbering mind of his servant; as if he would say, 'The sight of one favor prevents thee from raising thyself higher; and thus it happens that thou dost confine thy thoughts within too narrow limits. Now, therefore, enlarge thy mind, to receive also what I promise concerning Sarah. For the door of hope ought to be sufficiently open to admit the word in its full magnitude.'
And I will establish my covenant with him He confines the spiritual covenant to one family, in order that Abraham may hence learn to hope for the blessing before promised; for since he had framed for himself a false hope, not founded on the word of God, it was necessary that this false hope should first be dislodged from his heart, in order that he might now the more fully rely upon the heavenly oracles, and might fix the anchor of his faith, which before had wavered in a fallacious imagination, on the firm truth of God. He calls the covenant everlasting, in the sense which we have previously explained. He then declares that it shall not be bound to one person only, but shall be common to his whole race, that it may, by continual succession, descend to his posterity. Yet it may seem absurd, that God should command Ishmael, whom he deprives of his grace, to be circumcised. I answer; although the Lord constitutes Isaac the firstborn and