Be proud of your mistakes. Well, proud may not be exactly the right word, but respect them, treasure them, be kind to them, learn from them. And, more than that, and more important than that, make them. Make mistakes. Make great mistakes, make wonderful mistakes, make glorious mistakes. Better to make a hundred mistakes than to stare at a blank piece of paper too scared to do anything wrong.

He was painfully shy, which, as is often the manner of the painfully shy, he overcompensated for by being too loud at the wrong times.

The Time Lords really didn't like genocide. I'm not too keen on it myself. It's the potential you're killing off. What if, one day, there was a good Dalek? What if...

Charitably... I think... sometimes, perhaps, one must change or die. And, in the end, there were, perhaps, limits to how much he could let himself change.

An Angel who did not so much Fall as Saunter Vaguely Downwards.

What a refreshing mind you have, young man. There really is nothing quite like total ignorance, is there?

Adults follow paths. Children explore. Adults are content to walk the same way, hundreds of times, or thousands; perhaps it never occurs to adults to step off the paths, to creep beneath rhododendrons, to find the spaces between fences. I was a child, which meant that I knew a dozen different ways of getting out of our property and into the lane, ways that would not involve walking down our drive.