All existing entities depend on an energy source for survival. 'Demons' are no different, except they don't feed on physical food. Instead, they feed on dark energies like fear, negativity, hopelessness, ignorance, greed, apathy, pride, confusion, narcissism, selfishness, and so on.
In my experience, depression is a dying season, and these seasons only have to last as long as we're unwilling to let go of an outdated version of ourselves or an old way of living that has simply met its expiration date.
What I find particularly compelling about the 7 deadly sins is that they are all based on emotions. In fact, I think that instead of calling them 'sins', they'd be better identified as 'nasty' (undesirable) feelings that have the potential to develop into harmful actions.
