The Doctor: But sleep is vital. Sleep is wonderful. Even I sleep.
Clara: When?
The Doctor: Well, when you're not looking.

24 hours ago this station fell silent. No comm signal, nothing. Dead. We've come to find out why.

Nagata

You can't fight them Doctor. There's no point. They're the future. A new life form. A better life form. It's very clear to me now, they made me understand. And we're to be their food.

Rassmussen

Nagata: What are you doing?
The Doctor: I've hacked into your helmet-cams.
Nagata: What?
The Doctor: Reviewing the footage. There's something not right here.
Nagata: We don't have helmet-cams.

They came to find me. This is my station. My lab. I've pieced together the rescue as best I could.

Rassmussen

The Doctor: Let me negotiate peace. You can't commit mass murder...
Kate: Then why did you leave the gas with us?
The Doctor: The boxes are safeguards for both species.

Bonnie: It's empty, isn't it? Both boxes. There's nothing in them, just buttons.
The Doctor: Of course, and you know how you know that? Because you've started to think like me.

Clara: You must have thought I was dead for a while?
The Doctor: Yeah.
Clara: How was that?
The Doctor: Longest month of my life.
Clara: It could only have been 5 minutes.
The Doctor: I'll be the judge of time.

The Doctor: I need to know. Which one are you?
Osgood 1: I'm Osgood.
The Doctor: Human or Zygon?
Osgood 1: I'll answer that question one day. And do you know when that day will be?
Osgood 2: The day nobody cares about the answer.

Osgood: Never really met Clara. Pretty strong, yeah?
The Doctor: She was amazing.
Osgood: No, not was... is. It's not from the Zygon. It's from Clara.
The Doctor: How?
Osgood: She's not dead. She's in a pod somewhere.

You know, I'm over two thousand years old. I'm old enough to be your messiah.

The Doctor

The only way anyone can live in peace, is if they're prepared to forgive.

The Doctor

Doctor Who Quotes

Great men are forged in fire. It is the privilege of lesser men to light the flame. Whatever the cost.

Warrior Doctor

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?