Luke's code is simple, he refuses to bend the knee to any man for any reason. Luke doesn't want to rule, he wants not to be ruled; he is unruly.
This is, according a range of folks who are in a position to make an informed judgement, the greatest movie ever made. I'm not sure that's my opinion, but it's a very good movie in a lot of ways. It's a great movie to be sure. And while it's not my pick for greatest ever, I'd probably go so far as to agree that it's the greatest popular film ever made.