Kreacher Quotes in Harry Potter and the Order of the Phoenix
"Like the fact that the person Sirius cared most about in the world was you," said Dumbledore quietly. "Like the fact that you were coming to regard Sirius as a mixture of father and brother. Voldemort knew already, of course, that Sirius was in the Order, that you knew where he was—but Kreacher's information made him realize that the one person whom you would go to any lengths to rescue was Sirius Black."
"Sirius did not hate Kreacher," said Dumbledore. "He regarded him as a servant unworthy of much interest or notice. Indifference and neglect often do much more damage than outright dislike...the fountain we destroyed tonight told a lie. We wizards have mistreated and abused our fellows for too long, and we are now reaping our reward."