I get that deceit is the sin of the 3, but as far as I've experienced it, it's always been more self-deceit, with deceit of others being incidental to that self-deception. It's almost something I can't control: the presentation of myself in the best possible light. Even when I'm trying to get people see the negative aspects of my life, I can't help it coming out in a way that makes it in fact sound grand and wonderful and not at all bad. I don't intentionally mean to mislead anyone - I do use lies strategically sometimes, but not often - but it's almost not something I can consciously control. It's almost as though on the subconscious level, I'm thinking
oh god if they really knew how bad things are, they'll never look at you the same way again and this self-preservation mechanism kicks in.