The change of perspective needed to heal is to acknowledge that the exterior is right. "In the fight between you and the world, back the world." (Kafka). It's just that: it makes no sense to change the world because the world is already perfect as it is.
"Do not be angry, one day the world will do without you."
"It takes X muscles to smile, to be angry Y, X < Y, then it is best to smile."
All of these everyday phrases, are there to undermine the perception of being important to the world. In reality we are all unique, irreplaceable, and this is true. But this does not mean that the world needs us and we need to do something for the world.
The only thing really necessary for the world is to be ourselves. It is here, however, that there is the greatest difficulty, because being yourself does not mean you want to change the outside, but to accept the outside because the outside is nothing but our construction we have built. Healing is difficult for many because it requires the acceptance of our responsibility in the Creation.