Through Magica an individual human has the potential to become immensely powerful. However, no matter how great their power or great the artifacts they find, in the end they are still human. They could potentially have the power to call down catastrophe on a city, but they still age and die. A well placed arrow can always wound them. They cannot escape their inherent frailty.
As much as this seems like a tragedy, it is the only thing stopping them from becoming like demons. They are all equal in a limited life, and an eternal death.
This is just and right, and a true blessing of the heavens.
They do not have the mind necessary to face eternity without succumbing to base desires.
-Musings of the Highest of Angels