Well, it wasn't a quote, and it is an old lesson. But still, Luke won by refusing to fight his father.
You must have seen a different movie than I did. He didn't refuse to fight his father, he refused to expediently KILL his father. Even though he did fight his father, even delivering a dismembering blow, he was able to transcend his paralyzing fears of both giving into the dark-side and not protecting the people he cared about. Free from his fear, he became free to simply turn-down Palapatine's command to execute Darth Wheezer. Fortunately, his transcendence unlocked the better part of Anakin's nature, which came flooding out when the emperor brought out his force-Tesla-taze, resulting in the overthrow of the emperor, wheezer, and the armada of lawn darts.