Shirley Jackson said this quote

I was thinking that being a demon and a ghost must be very difficult, even for Charles; if he ever forgot, or let his disguise drop for a minute, he would be recognized at once and driven away; he must be extremely careful to use the same voice every time, and present the same face and the same manner without a slip; he must be constantly on guard against betraying himself. I wondered if he would turn back to his true self when he was dead.