"Certainly the most destructive vice if you like, that a person can have. More than pride, which is supposedly the number one of the cardinal sins - is self pity. Self pity is the worst possible emotion anyone can have. And the most destructive. It is, to slightly paraphrase what Wilde said about hatred, and I think actually hatred's a subset of self pity and not the other way around - ' It destroys everything around it, except itself '.