You figure out one side of it - the human side, say - and the eternal side goes into shadow. Or vice versa. It's like the old saw: What does a dragon in its shell look like? Well no one can ever tell, for as soon as you break the shell to see, the dragon is no longer in its shell. The real disaster of this inquiry is that it is in the very nature of evil to be secret.
Wicked: The Life and Times of the Wicked Witch of the West