Not-Donna: We came from nothing.

Not-Doctor: We are not-things.

Not-Donna: But you, you’re not nothing.

Not-Doctor: The notion of shape is strange.

Not-Donna: It limits. It is limiting.

Not-Thing: My arms are too long.

DOCTOR: Oh, I keep thinking, I wish I hadn't done that thing with the salt.

DONNA: What, the bad luck thing? But that was just a lie.

DOCTOR: Normally, except… I invoked a superstition at the edge of the universe, where the walls are thin and all things are possible. I've just got this feeling.

DONNA: What?

DOCTOR: A feeling of something… which is gone. Fine. Good. Onwards.

DOCTOR: It destroyed half the universe because of me. We stand here now on the edge of creation, a creation which I devastated. So, yes, I keep running. Of course I do. How am I supposed to look back on that?

DOCTOR: It's funny, cos I wonder where the TARDIS goes at random. Maybe it lands on some outcrop by the sea. And there's a tribe and they worship it for 100 years. Then they grow up and try to burn it. Then they get wise. They preserve it. Then they build a city all around it, till the TARDIS is just a tiny little dot, surrounded by skyscrapers and monorails. Time passes and the city falls. It all gets swept away. And there's the TARDIS… still on its outcrop… by the sea. She's the only thing I've got left.

DONNA: I was thinking… And let me finish, okay? I know I sound daft, but… I wonder how long they'll wait, Rose and Shaun and my mother. Standing there in that alley… waiting for the TARDIS to come back. What if we never do? And then time will pass. Rose will grow up, she'll have a life. She might go back to that alley once a year for old times' sake, but she'll move on. Not Shaun, though. He'll keep going back every single day. He's nice, you know. He's lovely. I hope you get to know him.

DOCTOR: It’s not about losing hope. It’s about never forgetting that hope's always there, even when you can’t see it.

DOCTOR: You don’t need me telling you your family isn’t always the one you were born in. Usually it is, and that’s great, that’s fantastic, but it’s not always like that, and that’s ok. And if you do find people who love you - hold on tight.

DOCTOR: Believing in magic is easy, the reaction of a cowardly mind to explain away any phenomenon that vexes the intellect. But finding magic in the realities of existence… seeking out some hidden truth to cling to from every painful experience we endure… that is never easy. That takes courage.

I’ve been too methodical recently, I think. Setting coordinates and things, actually deciding where we want to go. I’ve been getting far too safe and predictable these last few incarnations. Do you know I once traveled for centuries without ever knowing where I’d materialize next?

DOCTOR: (Blithely) Yes, I imagine so. It's quite clear that Frederick brought the car into the house, ran himself over with it, and put it back outside before he finally expired

DOCTOR: Professor Morgan, have you ever heard the expression “only the used key shines”?

MORGAN: What are you talking about?

DOCTOR: Wherever I go in the universe I invariably meet people like you - intelligent, knowledgeable people who, for reasons I can only guess at, reach a point in their lives when they arbitrarily decide to close their minds to anything new. You make it a point of personal pride to scoff, mock, and ridicule anybody who happens to inhabit a larger universe than the one in which you have chosen to imprison yourself - well that’s your business, you may believe I’m talking nonsense and I can’t help what you personally choose to believe, but I do know this - the only way to learn is to keep your mind open to the input of those who are more knowledgeable than yourself.