Harry Potter and the Philosopher's Stone

"But from that moment on, Hermione Granger became their friend. There are some things you can't share without ending up liking each other, and knocking out a twelve-foot mountain troll is one of them." p. 179

"'There are all kinds of courage,' said Dumbledore, smiling. 'It takes a great deal of bravery to stand up to our enemies, but just as much to stand up to our friends. I therefore award ten points to Mr. Neville Longbottom.'" p. 306