Failure is so important. We speak about success all the time. It is the ability to resist failure or use failure that often leads to greater success. I've met people who don't want to try for fear of failing.

If you are writing children's books, you need to be a ruthless killer.

The mistake ninety-nine percent of humanity made, as far as Fats could see, was being ashamed of what they were; lying about it, trying to be somebody else.

I don't mean to be rude—" he began, in a tone that threatened rudeness in every syllable. "Yet, sadly, accidental rudeness occurs alarmingly often," Dumbledore finished the sentence gravely.

Because to confide a part of your soul to something that can think and move for itself is obviously a very risky business.

I was very low and I had to achieve something. Without the challenge, I would have gone stark raving mad.

You think I'm a fool?" demanded Harry. "No, I think you're like James," said Lupin, "who would have regarded it as the height of dishonor to mistrust his friends.