How we cite our quotes: All quotations are from Star Wars: The Empire Strikes Back.
Quote #4
OBI-WAN: That boy is our last hope.
YODA: No. There is another.
While there's a lot of debate over the nature of this line, the most common interpretation is that it references Leia, who Luke doesn't yet realize is his sister. The Skywalker family tree is so messed up that it looks like a Rancor attacked it.
Quote #5
VADER: Your destiny lies with me, Skywalker. Obi-Wan knew this to be true.
You know, Vader could just be trash-talking here, but he might have a point. After all, why would Obi-Wan lie about the fate of Anakin Skywalker if he wasn't worried about Luke heading down the same path?
Quote #6
VADER: Obi-Wan never told you what happened to your father.
LUKE: He told me enough. It was you who killed him.
VADER: No. I am your father.
Here it is, folks: the paternity test heard around the world. The idea that Luke—who represents goodness and innocence—and Vader—who represents pure evil—are father and son transforms our understanding of not just this film, but also of A New Hope.