" The first humans who got possessed, the ones who went on to become saints; they weren’t all strong enough to control unbound spirits, were they? They couldn’t have been. At least some of them must have fought with their spirits the same way I do.”
“Yes,” the revenant said, after a long, ancient-feeling pause. “They were our friends.”
“Then does that mean we’re—”
“You had better not push it, nun. I can possess you whenever I want. I could do far worse than make you murder someone. I could make you try on hats. "

― Margaret Rogerson , Vespertine