Yes, it is true that “Every mental state, even madness, has its equilibrium based upon self-esteem. Its disturbance causes unhappiness.” A person who is mad even though he is aware of self-esteem and at a certain case the disturbance of mind causes unhappiness. Like in this story, the old Hagberd reached this state of equilibrium based upon self-esteemed when he lost his mind control and it causes unhappiness to him.