DOCTOR: I killed the Doctor for the notion of peace! For the notion that tyranny and evil must be fought, that the continued freedom of others was worth more than his life. And he wasn't the only one! So yes, I hope if I'm ever given the chance to end this war, I'd take it. Whatever the cost. However cruel it is in that moment, I pray I'm weak enough to sink to the level of my enemies. That I reject all I've ever stood for so that everything I've spent my lives defending can flourish again.

ALISTAIR: And if you have to kill millions to do it?

DOCTOR: Then I kill millions. And I pray to whatever deities are left in creation that it kills me too.