Ego

This is perhaps the most blinding one. With any of the other vices, at least the soul is aware of the handicap and even when it feels helpless, there is a desire to overcome. However when ego (in the form of superiority complex) is in place, the feeling of 'I am right and others are all wrong' comes up. Personal mistakes become invisible. Even good qualities of others seem bad. Cynicism prevails. Even highly knowledgeable souls who are speaking all the right things can be so caught up that the disconnect between thoughts, words and actions is not at all seen. The problem seems to be all on the other side. 'And because of me, somehow the situation gets salvaged.'

Hmmm... come to think of it, the problem is that the power to discern and decide get lost.