"It will be about how young Anakin Skywalker became evil and then was redeemed by his son. But it's also about the transformation of how his son came to find the call and then ultimately realize what it was. Because Luke works intuitively through most of the original trilogy until he gets to the very end. And it’s only in the last act—when he throws his sword down and says, “I’m not going to fight this”—that he makes a more conscious, rational decision. And he does it at the risk of his life because the Emperor is going to kill him. It’s only that way that he is able to redeem his father. It’s not as apparent in the earlier movies, but when you see the next trilogy, then you see the issue is, How do we get Darth Vader back? How do we get him back to that little boy that he was in the first movie, that good person who loved and was generous and kind? Who had a good heart."

--George Lucas