Harry Potter and the Half-Blood Prince
How we cite our quotes:
"Firstly, and very importantly, Voldemort was, I believe, more attached to this school than he has ever been to a person. Hogwarts was where he had been happiest; the first and only place he had felt at home." (20.67)
Why did Voldemort feel at home at Hogwarts? What kind of home had he known before? It's always fun to be really good at something, and if Voldemort had really been such a great wizard at a young age, that would have made him a Big Man On Campus (BMOC). He and Harry have that in common.
"I am surprised you have remained here so long," said Voldemort after a short pause. "I always wondered why a wizard such as yourself never wished to leave school." (20.159)
Now that we think about it, why has Dumbledore remained at Hogwarts? What is the appeal of teaching? Dumbledore, like Harry, seems uninterested in fame or money. He seeks to produce leaders who will affect the Wizarding community for the better.
"Of some kinds of magic," Dumbledore corrected him quietly. "Of some. Of others, you remain…forgive me…woefully ignorant." (20.170)
Oh, snap. Dumbledore sasses Voldemort. But he does so in the most polite way. Notice how, as Voldemort asks for a teaching position at Hogwarts, Dumbledore never raises his voice or gets overly emotional. He remains rational. He treats Voldemort with the respect he would treat any guest, and yet, he doesn't forget his role as teacher. He tries to teach Voldemort in this moment, which tells us that he still has hope that Voldemort might come around.