36:3.6 (400.1) The Life Carriers of a planetary corps are given a certain period in which to establish life on a new world, approximately one-half million years of the time of that planet. At the termination of this period, indicated by certain developmental attainments of the planetary life, they cease implantation efforts, and they may not subsequently add anything new or supplemental to the life of that planet.
36:3.7 (400.2) During the ages intervening between life establishment and the emergence of human creatures of moral status, the Life Carriers are permitted to manipulate the life environment and otherwise favorably directionize the course of biologic evolution. And this they do for long periods of time.
36:3.8 (400.3) When the Life Carriers operating on a new world have once succeeded in producing a being with will, with the power of moral decision and spiritual choice, then and there their work terminates—they are through; they may manipulate the evolving life no further. From this point forward the evolution of living things must proceed in accordance with the endowment of the inherent nature and tendencies which have already been imparted to, and established in, the planetary life formulas and patterns. The Life Carriers are not permitted to experiment or to interfere with will; they are not allowed to dominate or arbitrarily influence moral creatures.
36:3.9 (400.4) Upon the arrival of a Planetary Prince they prepare to leave, though two of the senior carriers and twelve custodians may volunteer, by taking temporary renunciation vows, to remain indefinitely on the planet as advisers in the matter of the further development and conservation of the life plasm. Two such Sons and their twelve associates are now serving on Urantia. 4. Melchizedek Life Carriers
36:4.1 (400.5) In every local system of inhabited worlds throughout Nebadon there is a single sphere whereon the Melchizedeks have functioned as life carriers. These abodes are known as the system
36:4.2 (400.6) The progeny of a Melchizedek life carrier and a Material Daughter are known as
36:4.3 (400.7) The midsonite creatures live and function as reproducing beings on their magnificent worlds until they are one thousand standard years of age; whereupon they are translated by seraphic transport. Midsoniters are nonreproducing beings thereafter because the technique of dematerialization which they pass through in preparation for enseraphiming forever deprives them of reproductive prerogatives.
36:4.4 (400.8) The present status of these beings can hardly be reckoned as either mortal or immortal, neither can they be definitely classified as human or divine. These creatures are not Adjuster indwelt, hence hardly immortal. But neither do they seem to be mortal; no midsoniter has experienced death. All midsoniters ever born in Nebadon are alive today, functioning on their native worlds, on some intervening sphere, or on the Salvington midsonite sphere in the finaliters’ group of worlds.
36:4.5 (401.1)
36:4.6 (401.2) It should be explained in this connection that the fifth group of seven primary worlds in the Salvington circuit are the Nebadon worlds of the finaliters. The children of the Melchizedek life carriers and the Material Daughters are domiciled on the seventh world of the finaliters, the Salvington midsonite sphere.
36:4.7 (401.3) The satellites of the seven primary worlds of the finaliters are the rendezvous of the personalities of the super- and central universes who may be executing assignments in Nebadon. While the ascending mortals go about freely on all of the cultural worlds and training spheres of the 490 worlds comprising the Melchizedek University, there are certain special schools and numerous restricted zones which they are not permitted to enter. This is especially true of the forty-nine spheres under the jurisdiction of the finaliters.