Wisdom from Granny Weatherwax:

‘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