Bill: What is that?
The Doctor: *That* is my theme tune, otherwise known as a distress call!
Bill: You *like* distress calls?
The Doctor: You only really see the true face of the universe when it’s asking for your help.

Space, the final frontier. ‘Final,’ because it wants to kill us.

The Doctor

You don’t have to go to outer space to find monsters. There’s plenty of things that wanna kill you right here on Earth!

Nardole

All right, you lot. Back to the estate agents. Better luck next time!

The Doctor

What’s the point of surviving if you never see anyone, if you hide yourself away from the world?! When did you last open the shutters?

The Doctor

Hope is its own form of cruelty.

The Caretaker

Harry: I’m scared.
The Doctor: Don’t be.
Harry: Why?
The Doctor: It doesn’t help.

Honestly, Doctor, there’s nothing going on! Nothing weird, nothing alien! Just an old house and a dodgy landlord, which is pretty standard for students.

Bill

The Doctor: Did you hear the tree squeaking when you arrived outside?
Bill: Yeah. It was the wind!
The Doctor: There wasn’t any wind...

The Doctor: I told you, you don’t steer the TARDIS, you reason with it.
Bill: How?
The Doctor: Unsuccessfully, most of the time.

Bill: Doesn’t anybody ever notice the TARDIS?
The Doctor: Your species hardly notices anything.

Bill: How is *that* a screwdriver?
The Doctor: In a very broad sense!
Bill: Oh, and how’s it sonic?
The Doctor: It makes a noise!

Doctor Who Quotes

Only in darkness are we revealed. [...] Goodness is not goodness that seeks advantage. Good is good in the final hour, in the deepest pit, without hope, without witness, without reward. Virtue is only virtue in extremis. This is what *he* believes, and this is the reason above all I love him, my husband. My madman in a box. My Doctor.

Nardole [quoting River Song]

The Doctor: Clara? You asked me what we're going to do, I told ya. We're going to go to hell, or wherever it is people go when they die, if there is anywhere. Whatever it is we're gonna go there and we're gonna find Danny. And if it is in any way possible, we're going to bring him home. Every culture has a concept of an afterlife. I always meant to have a look around, see if I could find one.
Clara: You're going to help me?
The Doctor: Well, why wouldn't I help you?
Clara: Because of what I just did, I just...
The Doctor: You betrayed me. You betrayed our trust, you betrayed our friendship, you betrayed everything that I've ever stood for. You let me down!
Clara: Then why are you helping me?
The Doctor: Why? Do you think that I care for you so little that betraying me would make a difference?