But if there's aliens setting off the volcano, doesn't that make it all right? For you to stop it?
Still part of history.
Well, I'm history to you. You saved me in 2008, you saved us all. Why's that different?
Some things are fixed, some things are in flux. Pompeii is fixed.
How do you know which is which?
[The Doctor turns around and looks Donna right in the eye.]
'Cause that's how I see the universe. Every waking second, I can see what is, what was, what could be, what must not. That's the burden of a Time Lord, Donna. And I'm the only one left.
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