Dorium: What's the point in delaying? How long have you delayed already?
The Doctor: I've been knocking about, a bit of a farewell tour. Things to do, people to see. There's always more. I can imagine a new color, save the dodo, join the Beatles. I have got a time machine, Dorium, it's all still going on. For me it never stops. Liz the First is still waiting in a glade to elope with me. I can help Rose Tyler with her homework. I can go on all Jack's stag parties in one night.
Dorium: Time catches up with us all, Doctor.
The Doctor: Well it has never laid a glove on me!