I believe in free will. Of those that, like us, are in a privileged situation at least. For you, for me: people who are living in western society, people who are not repressed, who are free. We can choose. The things go largely like you want them to go. You control your own life. Your own will is extremely powerful.

When Filch wasn't guarding the scene of the crime, he was skulking red-eyed through the corridors, lunging out at unsuspecting students and trying to put them in detention for things like "breathing loudly" and "looking happy.

Wherever I am, if I've got a book with me, I have a place I can go and be happy

When you have seen as much of life as I have, you will not underestimate the power of obsessive love.

Bad news, Harry. I've just been to see Professor McGonagall about the Firebolt. She – er, got a bit shirty with me. Told me I'd got my priorities wrong. Seemed to think I cared more about winning the Cup than I do about staying alive. Just because I told her I didn't care if it threw you off, as long as you caught the Snitch first.

Talent and intelligence never yet inoculated anyone against the caprice of the fates.

What must strike any intelligent witch or wizard on studying the so-called history of the Elder Wand is that every man who claims to have owned it has insisted that it is "unbeatable," when the known facts of its passage through many owners' hands demonstrate that has it not only been beaten hundreds of times, but that it also attracts trouble as Grumble the Grubby Goat attracted flies.