What's the point of being a grown-up if you don't get to be immature?

The Doctor: I've seen bigger. Clara: Really? The Doctor: Are you joking? It's massive!

Demons run when a good man goes to war.

The Doctor: Oh, now what's this, then? I love this. A big, flashy-lighty thing. That's what brought me here. Big, flashy-lighty things have got me written all over them. Not actually, but give me time... and a crayon.

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

I was called a misogynist because I was reducing women to mothers. 'Reducing women to mothers' – now there is possibly the most anti-women statement I've heard.

Madness is just what a genius looks like to a tiny mind.