Augustine of Hippo

But why was it after being "roughly handled" that Isaac gave his blessing? For in the last resort what Isaac said to Esau was spoken under constraint and force: "Behold, your dwelling will be by the fruitfulness of the earth and by the dew of heaven." And in case you should imagine yourself for that reason to be good—"You shall live by your sword and be servant to your brother." But in order that you shouldn't despair of yourself, since you can after all correct yourself—"But the time will come when you will put off and undo the yoke …

Sermon 4.35 ↗