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“That was the best Defense Against the Dark Arts lesson we've ever had, wasn't it?" said Ron...

"He seems like a very good teacher," said Hermoine approvingly. "But I wish I could have had a turn with the boggart -"

"What would it have been for you?" said Ron sniggering, "A piece of homework that only got nine out of ten?”
― J.K. Rowling, Harry Potter and the Prisoner of Azkaban

“Then you told me how you had tricked the boggart into thinking you a long-lost relative of his last master---a feat which had required extensive research into local lore---then bribed him with exotic seashells, for you remembered some obscure story about a boggart whose secret fantasy was to travel the world, boggarts being bound to their crumbling ruins, while I half listened in astonishment. I say half, because I was mostly just watching you, observing the way your mind clicks and whirrs like some fantastical clock. Truly, I have never met anyone with a better understanding of our nature, and that anyone includes the Folk. I suppose that's partly why---
Ah, but you really would kill me if I desecrated your scientific vessel with the end of that sentence.”
― Heather Fawcett, Emily Wilde's Encyclopaedia of Faeries

“If your spirit is persistently harmless or if it has shown itself to you, in a non-threatening way, then you most definitely have a ghost. The ghost can be frightening, by its very nature. But the ghost will never intentionally frighten you. They will be there for three reasons: 1. They used to live there and are attached to the location 2. They are trying to communicate something to the living or 3. They are protective of somebody who lives in the house and so they are “standing guardâ€� so to speak, over the loved one.”
― Alexei Maxim Russell, The New Homeowner's Guide to House Spirits