Harry Potter and the Deathly Hallows
How we cite our quotes:
"…Goblin notions of ownership, payment, and repayment are not the same as human ones. […] We are talking about a different kind of being," said Bill. "Dealings between wizards and goblins have been fraught for centuries. […] To a goblin, the rightful and true master of any object is the maker, not the purchaser. All goblin-made objects are, in goblin eyes, rightfully theirs." (25.93)
Bill reminds Harry that not everyone can be held to the same human standards – goblins have their own identity as a species, and thus live by their own rules.
"Karkaroff intends to flee if the Mark burns."
"Does he?" said Dumbledore softly… "And are you tempted to join him?"
"No," said Snape. […] "I am not such a coward."
"No," agreed Dumbledore. "You are a braver man by far than Igor Karkaroff. You know, I sometimes think we Sort too soon…" (33.144)
Dumbledore's comment that Hogwarts Sorts its students too soon implies that Snape's bravery should perhaps have placed him in Gryffindor – his true identity, which nobody else knows about, shows him to be as courageous and loyal as any true Gryffindor.
"Tell me one last thing," said Harry. "Is this real? Or has this been happening inside my head?"
Dumbledore beamed at him, and his voice sounded loud and strong in Harry's ears even though the bright mist was descending again, obscuring his figure.
"Of course it is happening inside your head, Harry, but why on earth should that mean that it is not real?" (35.96-98)
This is such a classic Dumbledore thing to say. It's a little trippy, a little goofy, and a little (OK, incredibly) deep and profound. Basically, he's telling Harry to trust what goes on inside his head – just because it's happening in there, doesn't mean it's imaginary or silly.