From the Urantia Papers:
"Always there is attached to the universe service a corps of ascending mortals, including the glorified midway creatures. These ascenders, after attaining Salvington, are used in an almost endless variety of activities in the conduct of universe affairs. From each level of achievement these advancing mortals reach back and down to extend a helping hand to their fellows who follow them in the upward climb. Such mortals of temporary sojourn on Salvington are assigned on requisition to practically all corps of celestial personalities as helpers, students, observers, and teachers."
"The mortal-survival plan has a practical and serviceable objective; you are not the recipients of all this divine labor and painstaking training only that you may survive just to enjoy endless bliss and eternal ease. There is a goal of transcendent service concealed beyond the horizon of the present universe age. If the Gods designed merely to take you on one long and eternal joy excursion, they certainly would not so largely turn the whole universe into one vast and intricate practical training school, requisition a substantial part of the celestial creation as teachers and instructors, and then spend ages upon ages piloting you, one by one, through this gigantic universe school of experiential training. The furtherance of the scheme of mortal progression seems to be one of the chief businesses of the present organized universe, and the majority of innumerable orders of created intelligences are either directly or indirectly engaged in advancing some phase of this progressive perfection plan."
Artwork & Graphic Design by Gwen Cleveland, David L. Hubbard