You want weapons? We're in a library! Books! The best weapons in the world!

I absolutely love television, and I don't mean to be vulgar, but as I keep having to explain to people from the movie industry, I get more power and more money doing television, so why on earth would I do a film?

You should always waste time when you don't have any. Time is not the boss of you. Rule 408.

Writing for adults often means just increasing the swearing - but find an alternative to swearing and you've probably got a better line.

Peter Capaldi, will always be Doctor Who. You retain the title forever. Ask your predecessors, they all think they're the real one. I've had Sunday lunch with Peter Davidson and David Tennant and they're eyeing each other like, 'It's me!

The Doctor: 'You know when grown-ups tell you everything's going to be fine, but you really think they're lying to make you feel better?' Amelia: 'Yeah...' The Doctor: 'Everything's going to be fine.

Never run when you're scared. Rule 7.