Donna Noble: He's saying you need to stop. The Doctor: I don't know how. Donna Noble: Well... I can tell you. Cos you know what I did when you went flying off in your blue box, Spaceman? I stayed in one place... and I lived day after day after day. The Doctor: It would drive me mad.
Donna Noble: [laughs] Yeah. It does. But you keep on going. And that's the adventure. The one adventure you've never had. Because I've... I've worked out what happened. You changed your face... and then you found me. Do you know why? The Doctor: No. Donna Noble: To come home.
Donna Noble: [final lines] You don't have to stay for ever. The Doctor: We'll see. Donna Noble: Do you miss it? Out there? The Doctor: The funny thing is, I fought all those battles for all those years... and now I know what for. This. I've never been so happy in my life.
spoiler
The Doctor: I don't know how.
Donna Noble: Well... I can tell you. Cos you know what I did when you went flying off in your blue box, Spaceman? I stayed in one place... and I lived day after day after day.
The Doctor: It would drive me mad.
The Doctor: No.
Donna Noble: To come home.
The Doctor: We'll see.
Donna Noble: Do you miss it? Out there?
The Doctor: The funny thing is, I fought all those battles for all those years... and now I know what for. This. I've never been so happy in my life.