What will be the mystery hidden behind the accomplishment of all desire in the next world to the earth-plane? Will power, with optimism. It is the conviction called Yaqin by the Sufis, that will be the guiding light on the path of the soul in the spiritual world. What will hinder the progress of the spirits is the lack of this, though it is not necessary that the soul who has been pessimistic here should remain pessimistic in the next world. It is possible that its journey onward will bring about a change once the soul becomes acquainted with the mysteries of hopefulness.