Harry Potter and the Prisoner of Azkaban (Harry Potter, #3)

by J.K. Rowling

Snape whirled about, robes swishing behind him, and stormed out of the ward. “Fellow seems quite unbalanced,” said Fudge, staring after him. “I’d watch out for him if I were you, Dumbledore.” “Oh, he’s not unbalanced,” said Dumbledore quietly. “He’s just suffered a severe disappointment.”

The consequences of our actions are always so complicated, so diverse, that predicting the future is a very difficult business indeed.

“You think the dead we have loved ever truly leave us? You think that we don’t recall them more clearly than ever in times of great trouble? Your father is alive in you, Harry, and shows himself most plainly when you have need of him. How else could you produce that particular Patronus? Prongs rode again last night.”