But would you kindly ponder this question: What would your good do if
evil didn't exist, and what would the earth look like if all the shadows
disappeared? After all, shadows are cast by things and people. Here is the
shadow of my sword. But shadows also come from trees and living beings.
Do you want to strip the earth of all trees and living things just because
of your fantasy of enjoying naked light? You're stupid.

Autor: Mikhail Bulgakov