The ego is the worst confidence trickster we could ever imagine cause you don't see it. The single biggest con, I am you. It hides in the last place you would ever look, within itself. It disguises it's thoughts as your thoughts, it's feelings as your feelings, you think it's you.
People will do anything to protect their ego's. People have no clue, they don't know there is a distinction. In religion the ego manifests itself as the devil.
 By creating an imaginary enemy, we've created a real enemy for ourselves. There is no such thing as an external enemy, no matter what the voice in your head says, all perception is a projection of the ego as the enemy.
Your greatest enemy is your own inner perception, your own ignorance, your ego.

Quotes from doctors at the end of Revolver by Guy Ritchie