Well? Come on then. Eat up. You're full? I expect so. Because there's quite a difference between what was and what should have been. There's an awful lot of one but there's an infinity of the other. An infinity is too much, even for your appetite.

The Doctor

Still hungry? Well I've brought something for you. This. The most important leaf in human history. The most important leaf in human history! It's full of stories, full of history. Full of a future that never got lived, days that should have been but never were. Passed onto me. This leaf isn't just the past, it's a whole future that never happened. There are millions and millions of unlived days but every day we live an infinity. All the days that never came, and these were my mum's.

Clara

You are unique in the universe. There is only one Merry Galell and there will never be another. Getting rid of that existence isn't a sacrifice, it is a waste.

The Doctor

Listen. There is one thing you need to know about me - well one thing apart from the blue box and the two hearts - we don't walk away.

The Doctor

Okay, can you pretend like I'm totally a space alien and explain?

Clara

Ah. For the festival of offerings. It takes place every thousand years or so when the rings align. It's quite a big thing actually, like pancake Tuesday.

The Doctor

What I would like to see is...somethin' awesome!

Clara

She's not possible!

The Doctor

Man: So I've got something for ya.
Woman: What? Ya kept it?
Man: Of course I kept it.
Woman: Why?
Man: Because this exact leaf had to grow in that exact way, in that exact place, so that precise wind could tear it from that precise branch and make it fly into this exact face at that exact moment. And, if just one of those tiny little things had never had happened, I'd never have met ya. Which makes this leaf the most important leaf in human history.

Doctor Who Season 7 Episode 8 Quotes

She's not possible!

The Doctor

Man: So I've got something for ya.
Woman: What? Ya kept it?
Man: Of course I kept it.
Woman: Why?
Man: Because this exact leaf had to grow in that exact way, in that exact place, so that precise wind could tear it from that precise branch and make it fly into this exact face at that exact moment. And, if just one of those tiny little things had never had happened, I'd never have met ya. Which makes this leaf the most important leaf in human history.