Princess Leia: "Luke, tell me. What's troubling you?"
Luke Skywalker: "Vader's here, now, on this moon."
Princess Leia: "How do you know?"
Luke Skywalker: "I feel his presence. But he can also feel mine. He's come for me. He can feel it when I'm near. That's why I have to go. As long as I stay, I'm endangering the group and our mission. I have to face him."
Princess Leia: "Why?"
Luke Skywalker: "He's my father."