Harry Potter and the Half-Blood Prince
[Harry:] "He accused me of being 'Dumbledore's man through and through.'"
[Dumbledore:] "How very rude of him."
[Harry:] "I told him I was."
Dumbledore opened his mouth to speak and then closed it again. Behind Harry, Fawkes the phoenix let out a low, soft, musical cry. To Harry's intense embarrassment, he suddenly realized that Dumbledore's bright blue eyes looked rather watery, and stared hastily at his own knees. When Dumbledore spoke, however, his voice was quite steady. (17.83-86)
"Ah, Harry, how often this happens, even between the best of friends! Each of us believes that what he has to say is much more important than anything the other might have to contribute." (17.104)