“They are only children,” Harry explained, “like you. You, however, are different, through no fault of your own, and that is all the matters to them.” He reached out and raised her chin as she looked down. “Some people will accept you for who you are, Gabrielle Delacour, and some people won’t. The ones that will are the ones that will be your friends for eternity. But you, you have to do the hardest thing.”
“What’s that?” she asked, as she looked into his eyes.
“Be yourself and don’t compromise. One of my best friends is a werewolf. He went to school with my father and my godfather. He is the bravest man I have ever met. He has stood up to injustice, to prejudice and persecution. And he is still the most honourable man I know. He is the sort of person that I aim to become.
“But I am determined, Gabrielle, that I’ll do what ever I can to stop it. I’ll stop the prejudice and persecution that comes from being different. It sickens me deep inside, that wonderful people are outcasts through no fault of their own. People smirking and looking down on others because of blood, because of race, because of species, is bigotry, pure and simple. All intelligent species are equal, and I won’t rest until that notion is enshrined in the core of human belief.”
And yes, that's part 3 of 3. Of what is supposed to be the last chapter. I'm still reading, so I can't say if it really is or not.