Raoul De Chagny: Christine, there is no Phantom of the Opera!
Nadir Khan (narrating): I am sorry to say that there was, indeed, a Phantom of the Opera, but for your peace of mind I will admit that he was not, literally, a ghost. Usually, the word ghost refers to a supernatural being, a shadow of something past, an ethereal creature that used to be human before being dead. However, sometimes there are creature whose misfortune is so unspeakable that being dead would probably be a better fate. Our Phantom, which I assure you, was very much alive, is, or was, one of these creatures: and that is why he called himself a Phantom, or a ghost, despite his being not dead yet.

elfinmirror:

“Oh, the wonderful speeches they made
to each other and the eternal vows they exchanged!  They played at
hearts as other children might play at ball; only, as it was really
their two hearts that they flung to and fro, they had to be very,
very handy to catch them, each time, without hurting them.”

-Gaston Leroux, “Phantom of the Opera”