What happened down in the dungeons between you and Professor... - J.K. Rowling, Harry Potter and the Sorcerer's Stone

"No, thanks,"said Harry. "The toilet's never had anything as horrible as your head down it— it might be sick."Then he ran, before Dudley could work out what he'd said."

"Your mother died to save you. If there is one thing Voldemort cannot understand, it is love. Love as powerful as your mother's for you leaves it's own mark. To have been loved so deeply, even though the person who loved us is gone, will give us some protection forever."

"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."

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

"Fear of a name increases fear of the thing itself."