So Sarah laughed to herself, saying, “After I am worn out, and my lord is old, shall I have pleasure?”
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...
These heavenly guests (being sent to confirm the promise lately made to Abraham, that he should have a son by Sarah), while they are receiving Abraham's kind entertainment, they return his kindness. He receives angels, and has angels' rewards, a gracious message from heaven, Mat 10:41. I. Care is taken that Sarah should be within hearing.
Commenting on Genesis 18:9-15
Therefore Sarah laughed within herself,.... Not for joy of a son, and as pleased with it, believing so it would be; but as disbelieving it, and perhaps deriding it, and confuting it with a laugh, which, though it did not appear in her countenance, was secretly in her heart: saying, not with her mouth, but in her mind: after I am waxed old, being almost...