" There’s no greys, only white that’s got grubby. I’m surprised you don’t know that. And sin, young man, is when you treat people as things. Including yourself. That’s what sin is.’
‘It’s a lot more complicated than that -’
‘No. It ain’t. When people say things are a lot more complicated than that, they means they’re getting worried that they won’t like the truth. People as things, that’s where it starts. "

― Terry Pratchett , Carpe Jugulum (Discworld #23; Witches #6)