Manias are created by inability to adjust to the world as it is. Insanity is our defense against a world which is not of our making or to our liking. The normal person can make such an adjustment. It is not always easy, but it si being done constantly. The person of inferior mental capacity cannot do this. He therefore creates a world in his mind which is his own idea of the world of his choice. He retreats to this world whenever the outer world becomes unbearable. This explains the periods of rationalism all mental cases have. The periods of rationalism depends upon the unbearableness of the real world.
There are many people of unsound mind who find one particular thing unbearable.
When this is the case,
he is said to be a victim of such a complex.