Kathy Nightingale: What's good about sad? Sally Sparrow: It's happy for deep people.

So is this how it works Doctor? You never interfere with the affairs of other peoples or planets, unless there are children crying?

Like most writers, I write about what has happened to me as that involves the minimum amount of research.

Rose: 'If you are an alien, how come you sound like you're from the north?' Doctor: 'Lots of planets have a north!

If it’s time to go, remember what you’re leaving. Remember the best.

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.

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.