I.M. FOREMAN: You’ve never been a woman, have you?

DOCTOR: I’m not sure I’ve ever even been a man.

DOCTOR: I'm afraid I don't believe in curses.

CHURCHWELL: A rationalist?

DOCTOR: Not exactly. I just look for the best in people.

DOCTOR: Break, damn you! Break! You've never had a spanner like this thrown in you! Chew on me till your teeth crack. Grind me up till your gears lock. I'm the nail in your tyre, the potato jammed in your exhaust pipe, the treacle poured in your petrol tank. I'm the banana peel beneath your foot, the joker that ruins your straight flush, the coin that always comes up heads and the gun you didn't know was loaded. I am the Doctor!

KANE: You can't build an ionic membrane from scratch.

DOCTOR: If I had crayons and half a can of Spam, I could build you from scratch.

DOCTOR: Planets die! Planets die and species fall. Creation blinks once, billions of lives gone! You see if often enough, you start to understand. The greatest godlike power is useless, defenseless against it. All you can do, all you can ever do, in a million and one ways, in variation upon variation, is to improvise. Like a mad musician unable to stop hammering at the keys of a broken instrument, that's me!