And by your sword shall you live, and shall serve your brother; and it shall come to pass when you shall have the dominion, that you shall break his yoke from off your neck.
All Commentaries on Genesis 27:40 Go To Genesis 27
Ambrose of Milan
AD 397
Nevertheless Esau brought it about by his demands and entreaties that he did receive a blessing but such a blessing as was in agreement and correspondence with the earlier one, namely, that he should serve his brother. Indeed, the one who could not command and rule the other ought to have served him, in order to be ruled by the one who was wiser. It was not the role of the holy patriarch to deliver his own son to the ignoble state of slavery. But since he had two sons, one without moderation and the other moderate and wise, in order to take care for both like a good father, he placed the moderate son over the immediate one, and he ordered the foolish one to obey the one who was wise. For the foolish man cannot of his own accord be a disciple of virtue or persevere in his intent, because the fool changes like the moon. Isaac was right to deny Esau freedom to make his own choices; else he might drift like a ship in the waves without a helmsman. But Isaac made him subject to his brother according to that which is written, “The unwise man is the slave of the wise man.” Therefore the patriarch was right to make him subject, so that he might amend his dispositions under rule and guidance. And so Isaac says, “By your sword shall you live; you shall serve your brother,” for holiness has mastery over cruelty and kindness excels over emotions that are harsh. .
