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

Nothing can ever be a rule in drama, because then you're saying certain things won't ever happen, and that would be very boring.

Sherlock Holmes can be wise and funny. He wasn't, at the beginning. But later on, he's got a bantering relationship with loads of people. He's got a wisdom that he didn't have in the early stage. But he stays on the mountain top, and he will die up there. He's not going to change that.

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

The Doctor: This is bad, I don't like this. [kicks console and yells in pain] Never use force, you just embarrass yourself. Unless you're cross, in which case... always use force! Amy: Shall I run and get the manual? The Doctor: I threw it in a supernova. Amy: You threw the manual in a supernova? Why? The Doctor: Because I disagreed with it! Now stop talking to me when I'm cross!

You can be as beautiful and charming as you'd like, but if you're not terrific at acting, it will mean nothing on the screen.

Do you know how you make someone into a Dalek? Subtract Love, add Anger.