“One day, I shall come back — yes, I shall come back. Until then, there must be no regrets, no tears, no anxieties. Just go forward in all your beliefs, and prove to me that I am not mistaken in mine. Goodbye, Susan, goodbye, my dear.”

“Nothing’s sad until it’s over, and then everything is.”

“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.”

“Who I am is where I stand. Where I stand is where I fall.”

“Never give up. Never give in.”

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

“Oh, the blossomiest blossom. That's the only sad thing. I want to know what happens next. Right, then. Doctor Whoever-I'm-about-to-be. Tag, you're it.”

“People assume that time is a strict progression of cause to effect, but actually from a non-linear, non-subjective viewpoint, it's more like a big ball of wibbly-wobbly, timey-wimey... stuff.”

“But the final responsibility is mine, and mine alone. Listen, if someone who knew the future pointed out a child to you and told you that that child would grow up totally evil, to be a ruthless dictator who would destroy millions of lives, could you then kill that child?”

“Two hearts. One happy, one sad.”

“Now I'll never know if I was right.”

“That's the trouble with computers. Always think in black and white. No aquamarines, no blues, no imagination.”

TENTH DOCTOR: What? What?

SIXTH DOCTOR: What are you afraid will happen if you pause for breath?

TENTH DOCTOR: That there won't be another.

“You know what I think? I think it's not over, because I don't think she's dead. I really don't. That's not just me being mad, cos I honestly think in my heart and soul that he came back for her. Right at the end, the Doctor came back for his Sarah Jane, and he said, shall we go? Out into the stars? One last trip? And she said, oh yes please. And I think they're out there now, Sarah Jane and the Doctor in the TARDIS, travelling through space and time forever, in a story that never ends.”

DAVROS: The Daleks shall become Lords of Time! We shall become all-

DOCTOR: - Powerful. Crush the lesser races. Conquer the galaxy. Unimaginable power. Unlimited rice pudding, et cetera, et cetera.

DOCTOR: The Daleks have failed! Why don't you finish the job and make the Daleks extinct. Rid the Universe of your filth. Why don't you just die?

DALEK: You would make a good Dalek.

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. And 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: Perhaps it's just... a bloke.

FIRST DOCTOR: A... bloke?

BILL: Yeah! Perhaps it's just some bloke, wandering around, putting everything right when it goes wrong.

FIRST DOCTOR: Well, that would be a nice story, wouldn't it?

BILL: That would be the best.

“I am the Doctor. I'm coming to find you, and I will never, ever stop.”

“I know these teeth. What? What? What?!”

“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?”

SALLY: I love old things. They make me feel sad.

KATHY: What's good about sad?

SALLY: It's happy for deep people.

“I was once a man with a masterplan. I’d seek out injustices, topple governments, all in the name of the greater good. I’d started doing the maths, you see…. This is how evil starts, with the belief that the ends justify the means. But once you start down that road, there’s no turning back. What if you can save a million lives, but you have to let ten people die, or a hundred, or a hundred thousand. Where do you stop?”

DONNA: Was it me, or was Isaac Newton hot?

DOCTOR: He was, wasn't he? He was so hot. Oh! Is that who I am now?

DONNA: Well, it was never that far from the surface, mate. I always thought…

“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.”

“My arms are too long.”

“Have you got the controls set to "famous", or what?”

FLOOD: Busy man, sweetheart. You and your box of tricks. You look like you've lost a pound and found a sixpence. What's wrong?

DOCTOR: Just wondering. Maybe I'm the bad luck.

RUBY: Who are you?

DOCTOR: I'm the Doctor.

STRAX: Colonel Manton, you will give the order for your men to withdraw.

DOCTOR: No. Colonel Manton, I want you to tell your men to run away.

MANTON: You what?

DOCTOR: Those words. Run away. I want you to be famous for those exact words. I want people to call you Colonel Run Away. I want children laughing outside your door, because they've found the house of Colonel Run Away. And, when people come to you, and ask if trying to get to me through the people I love is in any way a good idea, I want you to tell them your name. Oh, look, I'm angry. That's new. I'm really not sure what's going to happen now.

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

“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.”

YASMIN: Make a wish and skim it.

DOCTOR: I wish...

YASMIN: You can't say your wish out loud!

DOCTOR: You can where I'm from. I wish... I wish this would go on forever.

RAM: What about football?

DOCTOR: Unbelievably boring sport. Now, darts? Darts is something worth practising for. Maths and alcoholic beverages. The best way to spend a morning.

“Oh, come on! Cheer up! It's not that hard. It's no harder than all these exams that you have to take these days. Except for Media Studies. It's going to be harder than that.”

“None of us know for sure what's out there. That's why we keep looking. Keep your faith. Travel hopefully. The universe'll surprise you... constantly.”

ACE: Oh, "No coloured" signs in 1963, "Pakis out" and petrol bombs in my time - now it's the future and it's ethnic cleansing. Nothing changes, does it?

DOCTOR: Forty years ago, Harper wouldn't even have been out of the ordinary. It does change, you know. Never completely, never all at once, but it does.

ACE: But when?

DOCTOR: Are you looking for the butterfly?

ACE: What the one who beats its wings and tips the balance, so the hurricane forms? There isn't one, is there?

DOCTOR: Not often. They just tell the butterflies that to keep them happy.

ACE: I should have known.

DOCTOR: No, mostly they break the butterfly on the wheel of time. But over the decades, the millions of butterflies, the weather still changes somehow. That's time. A million, multi-coloured pieces of time.

ACE: You could turn it all around you know, reach your hand in and just... well, change everything!

DOCTOR: Yes. But then I'm a silly old man, with far too much time in his hands already.

“This is ridiculous! How can you go from plenty of time to running out of time in no time at all?”

“So, that's the trap. Or the test, or the final judgment, I don't know. But if I kill you, I kill her. Except that implies in this big grand scheme of Gods and Devils that she's just a victim. But I've seen a lot of this universe. I've seen fake gods and bad gods and demi-gods and would-be gods, and out of all that, out of that whole pantheon, if I believe in one thing, just one thing, I believe in her.”

DALEK TIME CONTROLLER: (speaker) You will surrender.

LUCIE MILLER: Not likely, mate. You come here, you mess up my planet, you mess up my life, and now you say you're going to kill the best bloke I ever met? You think I'm going to just, what, bleedin' surrender? Well, all I can say is you don't know me. You don't know me at all. And just in case you wanted to know who it was who blew you to pieces, the name is Lucie Miller. You got that? Lucie bleedin' Miller!

“You've got the rest of your life. The faster you think, the slower it will pass. Concentrate. Assume you're going to survive. Always assume that. Imagine you've already survived. There's a storm room in your mind. Lock the door and think. This is my storm room. I always imagine that I'm back in my TARDIS, showing off, telling you how I escaped, making you laugh. That's what I'm doing right now. I am falling, Clara. I'm dying. And I am going to explain to you how I survived. I can't wait to hear what I say. I'm nothing without an audience.”