Harry Potter had much bitterness in his life. Deprived of his parents at a young age, his life at the Dursleys was miserable. At Hogwarts, through no fault of his own, he was the target of both students and teachers. And of course he was always in life threatening peril from the man who had killed his parents. If anyone had the right to feel embittered, it was Harry. And yet, he showed that you can experience bitterness without becoming embittered. You can take the lessons of your suffering and use them to appreciate your blessings and to spare others suffering. This is how we experience the bitter herb at Passover. We recognize the bitterness of our servitude, but as we are about to see, we use it as a prelude to sweetness and as a lesson to prevent others from suffering like we did.

haggadah Section: Maror
Source: The (unofficial) Hogwarts Haggadah by Moshe Rosenberg