Madame Kovarian: The anger of a good man is not a problem. Good men have too many rules. The Doctor: Good men don't need rules. Today is not the day to find out why I have so many.

Demons run when a good man goes to war. Night will fall and drown the sun when a good man goes to war. Friendship dies and true love lies. Night will fall and the dark will rise when a good man goes to war. Demons run but count the cost; the battle's won but the child is lost.

You don't want to take over the universe. You wouldn't know what to do with it beyond shout at it.

My priorities are where they should be, which is making really great, really exciting television.

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

You'll go out of business if you think people are stupid.

I don't think, generally speaking, people become writers because they were the really good, really cool, attractive kid in class. I'll be honest. This is our revenge for people who were much better looking and more popular than us. I was a bit like that, I suppose.