To face yourself, it is to confront the side you rejected, the dark feelings you harbored. That video showed what happened if you rejected it. The Shadow as it is called will go berserk and change into a monstrous version of a Shadow. If you defeat and calm that berserk shadow, you can confront it again. To accept it is to show your resolve and confront the hardships. That the meaning of bearing a persona. There are exceptions, but you must research it your self.