Envy is unsettling because it projects from one's own insecurities and fears. The subject of our envy is merely a canvas on which we paint with our splashed emotions of anger, resentment, inferiority and disgust. This is precisely why envy is so hard to over-come, because what we are trying to over-come are our own demons. It is the Hydra of all inner monsters, no matter how many heads you chop off, many more emerge.
Envy can prove to be one of the strongest chains binding you to your past. It prevents you from moving on, dragging you back again and again to an imaginary arena in which the chanting crowd is constantly cheering to the death-match between you and your opponent, even though in reality, no one is comparing. Even if they are, what matters is whether you are comparing.