Sin

'There's a very interesting debate raging at the moment about the nature of sin...'
'And what do they think? Against it, are they?'
'It's not as simple as that. It's not a black and white issue. There are so many shades of grey.'
'There's no greys, only white that's got grubby. I'm surprised you don't know that. And sin...is when you treat people as things. Including yourself. That's what sin is.'
-'Carpe Jugulum', Terry Pratchett, pg 314