DOCTOR: The human race, you're obsessed. You all need to get a hobby.

CLARA: I've got a hobby, thanks. It's you, by the way.

DOCTOR: Immortality isn't living forever. That's not what it feels like. Immortality is everybody else dying. She might meet someone she can't bear to lose. That happens, I believe.

DOCTOR: I'm so sick of losing.

CLARA: You didn't lose. You saved the town.

DOCTOR: I don't mean the war. I'll lose any war you like. I'm sick of losing people.