The Doctor: If I change the events that brought you here, you will never come her and ask me to change those events! Paradox loop. The timeline disintegrates, your timeline, and yes!
Clara: Yes?
The Doctor: I did just say no. Throw away the key.

You told me once what it would take to destroy a TARDIS key. That's what's so good about lava. All seven from all of your hiding places.

Clara

Danny I will never say those words again, not to anybody else. Ever. Those words from me are yours now.

Clara

What is it with you people? You hear voices you wanna shut them up, the trees come to save you, you want to chop them down.

The Doctor

I was wrong. The trees are not your enemy, they're your shield. They've been saving you since forever, protecting you from everything that space can throw at you.

The Doctor

The Doctor: I can save you.
Clara: I don't want you to.
The Doctor: You don't want to live?
Clara: Of course I want to live, I just...
The Doctor: What?
Clara: Don't make me say it.
The Doctor: I don't want to be the last of my kind.

I just informed you the planet is going to be razed by a solar flare and you're concerned about a row with your boyfriend.

The Doctor

Clara: I'm actually frightened I never get frightened why am I frightened?
The Doctor: You just lost a little girl.
Clara: Yes, that is a worry, but I know you'll find her. No no no. This, this is not worry. This is a threat.

Yes, well there are some things I have not seen. That's usually because I have chosen not to see them. Even my incredibly long life is too short for Les Miserables.

The Doctor

Do you like the forest being in Trafalgar Square? I think it's lovely.

Little Girl

Clara. My Clara. I have chosen well.

Missy

Clara: Just say it! Why can't you just say it. Why can't you just say I did good?
The Doctor: Talk to soldier boy.
Clara: Not him. C'mon. Why can't you just say it? I was The Doctor and I was quite good.
The Doctor: You were an exceptional Doctor, Clara.
Clara: Thank you.
The Doctor: Goodness had nothing to do with it.