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.

It was his own grief turned magically to song.

I love a good Dorothy L. Sayers.

Why can’t I drink the potion instead?” asked Harry desperately. “Because I am much older, much cleverer, and much less valuable,” said Dumbledore.

You know, I sometimes think we Sort too soon.

Be ruthless about protecting writing days, i.e., do not cave in to endless requests to have "essential" and "long overdue" meetings on those days.

It does not do to dwell on dreams and forget to live.