Joseph is a fruitful bough, even a fruitful bough by a well; whose branches run over the wall:
All Commentaries on Genesis 49:22 Go To Genesis 49
Ambrose of Milan
AD 397
“My young son”—in truth he was young, for he was almost the last to be born. Indeed, Scripture also says, “Jacob loved him, because he was the son of his old age.” This has reference likewise to Christ. For the Son of God, rising like the dawn through his birth from the Virgin Mary, came late to a world that was growing old and on the point of perishing. As a son of old age, he took on a body according to the mystery, while before the ages he was always with his Father. For this reason the Father says to him, “Return to me,” calling forth from earth to heaven the one whom he had sent for our salvation. And so, raising up his onlybegotten Son, he made vain the counsel of those who spoke evil.