It ceased to be with Sarah after the manner of women - And consequently, naturally speaking, conception could not take place; therefore if she have a son it must be in a supernatural or miraculous way.

Now Abraham and Sarah were old, and well stricken in age,.... The one being ninety nine years of age, and the other eighty nine; and which is observed to make it the more surprising that they should have a son at such an age; and what follows still makes it more so:

and it ceased to be with Sarah after the manner of women; her monthly visitors had left her, so that she was unfit for conception, and there could be no hope of it in a natural way; though the philosopher (w) intimates, that there are some, that it is possible, may conceive without them.

(w) Aristot. Hist. Animal. l. 7. c. 2.

Now Abraham and Sarah were old and well stricken in age; and it ceased to be with Sarah after the manner of women.

18:9-15 Where is Sarah thy wife? was asked. Note the answer, In the tent. Just at hand, in her proper place, occupied in her household concerns. There is nothing got by gadding. Those are most likely to receive comfort from God and his promises, who are in their proper place, and in the way of their duty, Lu 2:8. We are slow of heart to believe, and need line upon line to the same purport. The blessings others have from common providence, believers have from the Divine promise, which makes them very sweet, and very sure. The spiritual seed of Abraham owe their life, and joy, and hope, and all, to the promise. Sarah thinks this too good news to be true; she laughed, and therefore cannot as yet find in her heart to believe it. Sarah laughed. We might not have thought there was a difference between Sarah's laughter and Abraham's, ch. 17:17; but He who searches the heart, saw that the one sprung from unbelief, and the other from faith. She denied that she had laughed. One sin commonly brings in another, and it is not likely we shall strictly keep to truth, when we question the Divine truth. But whom the Lord loves he will rebuke, convict, silence, and bring to repentance, and if they sin before him.