Genesis 20:2

2.And Abraham said of Sarah his wife. In this history, the Holy Spirit presents to us a remarkable instance, both of the infirmity of man, and of the grace of God. It is a common proverb, that even fools become wise by suffering evil. But Abraham, forgetful of the great danger which had befallen him in Egypt, once more strikes his foot against the same stone; although the Lord had purposely chastised him, in order that the warning might be useful to him, throughout his whole life. Therefore we perceive, in the example of the holy patriarch, how easily the oblivion, both of the chastisements and the favors of God, steals over us. For it is impossible to excuse his gross negligence, in not calling to mind, that he had once tempted God; and that he would have had himself alone to blame, if his wife had become the property of another man. But if we thoroughly examine ourselves scarcely any one will be found who will not acknowledge, that he has often offended in the same way. It may be added, that Abraham was not free from the charge of ingratitude; because, if he had rejected that his wife had been wonderfully preserved to him by the Lord, he would never again, knowingly and willingly, have cast himself into similar danger. For he makes the former favor divinely offered unto him, so far as he is able, of none effect. We must, however, notice the nature of the sin, on which we have touched before. For Abraham did not, for the sake of providing for his own safety prostitute his wife, (as impious men cavil.) But, as he had before been anxious to preserve his life, till he should receive the seed divinely promised to him; so now, seeing his wife with child, in the hope of enjoying so great a blessing, he thought nothing of his wife’s danger. (428) Therefore if we thoroughly weigh all things, he sinned through unbelief, by attributing less than he ought to the providence of God. Whence also, we are admonished, how dangerous a thing it is, to trust our own counsels. For Abraham’s disposition is right, while fixing his attention on the promise of God; but inasmuch as he does not patiently wait for God’s helps but turns aside to the use of unlawful means, he is, in this respect, worthy of censure.

And Abimelech sent. There is no doubt that the Lord purposed to punish his servant, for the counsel he had so rashly taken. And such fruits of distrust do all receive, who rely not, as they ought, on the providence of God. Some perverse men quarrel with this passage; because nothing seems to them more improbable than that a decrepit old woman should be desired by the king, and taken from the bosom of her husband. But we answer, first, that it is not known what her appearance was, except that Moses before declared her to be a person of singular beauty. And it is possible that she was not much worn with age. For we often see some women in their fortieth year more wrinkled than others in their seventieth. But here another thing is to be considered, that, by the unwonted favor of God, her comeliness was preeminent among her other endowments. It might also be, that king Abimelech was less attracted by the elegance of her form, than by the rare virtues with which he saw her, as a matron, to be endued. Lastly, we must remember, that this whole affair was directed by the hand of God, in order that Abraham might receive the due reward of his folly. And as we find that they who are exceedingly acute in discerning the natural causes of things, are yet most blind in reference to the divine judgments; let this single fact suffice us, that Abimelech, being a minister to execute the divine chastisement, acted under a secret impulse.