DOCTOR: You know Tegan, sometimes I wonder how well I'd get along without you.

TEGAN: Thank you.

DOCTOR: Probably quite alright, all things considered. Now, a fresh cup of tea would be terribly useful.

TEGAN: Yeah? Well, you know where the kitchen is.

DOCTOR: Never be cruel. Never be cowardly. Hate is always foolish. Love is always wise. Always try to be nice, but never fail to be kind.

DOCTOR: People plus technology minus humanity. The internet, cyberspace, Cybermen. Always read the comments, because one day they'll be an army.

DOCTOR: Winning? Is that what you think it's about? I'm not trying to win. I'm not doing this because I want to beat someone, or because I hate someone, or because, because I want to blame someone. It's not because it's fun and God knows it's not because it's easy. It's not even because it works, because it hardly ever does. I do what I do, because it's right! Because it's decent! And above all, it's kind. It's just that. Just kind. If I run away today, good people will die. If I stand and fight, some of them might live. Maybe not many, maybe not for long. Hey, you know, maybe there's no point in any of this at all, but it's the best I can do, so I'm going to do it. And I will stand here doing it till it kills me. You're going to die too, some day. How will that be? Have you thought about it? What would you die for? Who I am is where I stand. Where I stand, is where I fall. Stand with me. These people are terrified. Maybe we can help, a little. Why not, just at the end, just be kind?

FIRST DOCTOR: The Doctor? No, I don't think so! No, dear me, no! You may be a Doctor, but I am the Doctor. The original, you might say!

DOCTOR: Who I am is where I stand. Where I stand is where I fall.

(Talking about Missy)

BILL: She's a murderer.

DOCTOR: Enjoying your bacon sandwich?

BILL: Why?

DOCTOR: Because it had a mummy and a daddy. Go tell a pig about your moral high ground.

DOCTOR: Time And Relative Dimension In Space. TARDIS for short. You're safe in here. You're safe in here and you always will be.

RIVER: So, assuming tonight is all we have left.

DOCTOR: I didn't say that.

RIVER: How long is a night on Darillium?

DOCTOR: Twenty four years.

RIVER: I hate you.

DOCTOR: No, you don't.

DOCTOR: Times end, River, because they have to. Because there's no such thing as happy ever after. It's just a lie we tell ourselves because the truth is so hard.

RIVER: No, Doctor, you're wrong. Happy ever after doesn't mean forever. It just means time. A little time. But that's not the sort of thing you could ever understand, is it?

RIVER: Does sarcasm help?

DOCTOR: Wouldn't it be a great universe if it did?

DOCTOR: My entire understanding of physical space has been transformed! Three-dimensional Euclidean geometry has been torn up, thrown in the air and snogged to death! My grasp of the universal constants of physical reality has been changed forever!

DOCTOR: Sorry. I've always wanted to see that done properly.

DOCTOR: It's my back.

RIVER: Your back?

DOCTOR: Yeah, my back's playing up. It simply refuses to carry the weight of an entirely pointless stratum of society who contribute nothing of worth to the world and crush the hopes and dreams of working people.

RIVER: You don't look much like your pictures.

DOCTOR: Well, that's an ongoing problem for me.

DOCTOR: Never eat pears. They're too squishy and they always make your chin wet. That one's quite important. Write it down.

DOCTOR: Nothing’s sad until it’s over, and then everything is.

DOCTOR: If you think because she is dead I am weak, then you understand very little. If you were any part of killing her, and you're not afraid, then you understand nothing at all. So, for your own sake, understand this. I am the Doctor. I'm coming to find you, and I will never, ever stop.

DOCTOR: As you come into this world, something else is also born. You begin your life, and it begins a journey towards you. It moves slowly, but it never stops. Wherever you go, whatever path you take, it will follow. Never faster, never slower, always coming. You will run. It will walk. You will rest. It will not. One day, you will linger in the same place too long. You will sit too still or sleep too deep, and when, too late, you rise to go, you will notice a second shadow next to yours. Your life will then be over.

DOCTOR: I've finally run out of corridor. There's a life summed up.

DOCTOR: Do you know what thinking is? It’s just a fancy word for changing your mind.

DOCTOR: The human race, you're obsessed. You all need to get a hobby.

CLARA: I've got a hobby, thanks. It's you, by the way.

MISSY: Apparently, you think you're going to die tomorrow.

DOCTOR: Well, I've got some good news about that.

MISSY: Oh, yeah?

DOCTOR: It's still today!

DOCTOR: There's a horror movie called Alien? That's really offensive. No wonder everyone keeps invading you.

DOCTOR: You're doing it again.

CLARA: Doing what?

DOCTOR: The smile.

CLARA: Yeah, I'm smiling.

DOCTOR: It's the sad smile. It's a smile but you're sad. It's confusing. It's like two emotions at once. It's like you're malfunctioning.