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.
The tao that can be tar(1)ed is not the entire Tao. The path that can be specified is not the Full Path.