Luke Skywalker: You told me Vader betrayed and murdered my father.
Obi-Wan Kenobi: Your father was seduced by the dark side of the force: he ceased to be Anakin Skywalker and became Darth Vader; when that happened, the good man who was your father was destroyed. So, what I told you was true...from a certain point of view.
Darth Vader: You cannot hide forever, Luke.
Luke Skywalker: I will not fight you.
Darth Vader: Give yourself to the Dark Side. It is the only way to save your friends. Yes, your thoughts betray you. Your feelings for them are strong. Especially for...sister. So, you have a twin sister. Your feelings have now betrayed her too. Obi-Wan was wise to hide her from me. Now his failure is complete. If you will not turn to the Dark Side, then perhaps she will.
Luke Skywalker: [ignites lightsaber.] NEVER!