First Doctor: There is good and there is evil. I left Gallifrey to answer a question of my own. By any analysis, evil should always win. Good is not a practical survival strategy - it requires loyalty, self-sacrifice and love. So, why does good prevail? What keeps the balance between good and evil in this appalling universe? Is there some kind of logic? Some mysterious force?
Bill Potts: Perhaps there's just some bloke, wandering around, putting everything right when it goes wrong?
Twelfth Doctor: You know what? You're a bit of a legend these days... but not everyone believes it. People don't think that it could happen. That someone like you could turn against your own kind. Because your kind don't do that. Because people don't believe there could be any such thing... as a good Dalek.
Dalek: I am not a good Dalek. You are a good Dalek.
Bill Potts (to 12th): You're an arse. Do you know that? You're a... You're a stupid bloody arse.
First Doctor: If I hear any more language like that from you, young lady, you're in for a jolly good smacked bottom.
Twelfth Doctor: Can we just pretend that that never happened?
Bill Potts: I'm a broad-minded girl - I mean, I know we have this whole professor/student thing going on...
Twelfth Doctor: Can we never, ever talk about this again?
Bill Potts: I hope we talk about it loads. I hope we spend years laughing about it.
First Doctor: Who the hell do you think you are?
Twelfth Doctor: The Doctor.
First Doctor: I am the Doctor. Who you are, I cannot begin to imagine.
The Testimony: Then let us show you, Doctor. See who you will become. Doctor! Exterminate! You will be assimilated.
Twelfth Doctor: No. No, that's not a good idea!
The Testimony: They all died. The Doctor has walked in blood through all of time and space. The Doctor has many names... the destroyer of the world... The Imp of the Pandorica, the Shadow of the Valeyard, the Beast of Trenzalore, the Butcher of Skull Moon, the Last Tree of Garsennon, the Destroyer of Skaro. He is the Doctor of War.