It was the Curator's last line.
- DOCTOR: Is that what I'm supposed to do now? Go looking for Gallifrey?
- CURATOR: Oh, it's entirely up to you. Your choice, eh? I can only tell you what I would do if I were you. Oh, if I were you. Oh, perhaps I was you, of course. Or perhaps you are me. Congratulations.
- DOCTOR: Thank you very much.
- CURATOR: Or perhaps it doesn't matter either way. Who knows, eh? Who knows?