The fact that monasticism preceded the identification of greed as a primal sin is an important reminder that our very ability to name sin is a theological achievement.
I am generally wary of the demand for 'likeability' in fiction, which I think is a bastardisation of the demand of identification - itself something of a suspect notion.
That's what I always hoped for when I became an actor - that you would do something that people can escape to, find identification with and excitement in and be able to talk about it in bars, restaurants, and workplaces.
