P585:5, 51:5.1 When a Planetary Adam and Eve arrive on an inhabited world, they have been fully instructed by their superiors as to the best way to effect the improvement of the existing races of intelligent beings. The plan of procedure is not uniform; much is left to the judgment of the ministering pair, and mistakes are not infrequent, especially on disordered, insurrectionary worlds, such as Urantia.
P585:6, 51:5.2 Usually the violet peoples do not begin to amalgamate with the planetary natives until their own group numbers over one million. But in the meantime the staff of the Planetary Prince proclaims that the children of the Gods have come down, as it were, to be one with the races of men; and the people eagerly look forward to the day when announcement will be made that those who have qualified as belonging to the superior racial strains may proceed to the Garden of Eden and be there chosen by the sons and daughters of Adam as the evolutionary fathers and mothers of the new and blended order of mankind.
P585:7, 51:5.3 On normal worlds the Planetary Adam and Eve never mate with the evolutionary races. This work of biologic betterment is a function of the Adamic progeny. But these Adamites do not go out among the races; the prince's staff bring to the Garden of Eden the superior men and women for voluntary mating with the Adamic offspring. And on most worlds it is considered the highest honor to be selected as a candidate for mating with the sons and daughters of the garden.
P586:1, 51:5.4 For the first time the racial wars and other tribal struggles are diminished, while the world races increasingly strive to qualify for recognition and admission to the garden. You can at best have but a very meager idea of how this competitive struggle comes to occupy the center of all activities on a normal planet. This whole scheme of race improvement was early wrecked on Urantia.
P586:2, 51:5.5 The violet race is a monogamous people, and every evolutionary man or woman uniting with the Adamic sons and daughters pledges not to take other mates and to instruct his or her children in single- matedness. The children of each of these unions are educated and trained in the schools of the Planetary Prince and then are permitted to go forth to the race of their evolutionary parent, there to marry among the selected groups of superior mortals.
P586:3, 51:5.6 When this strain of the Material Sons is added to the evolving races of the worlds, a new and greater era of evolutionary progress is initiated. Following this procreative outpouring of imported ability and superevolutionary traits there ensues a succession of rapid strides in civilization and racial development; in one hundred thousand years more progress is made than in a million years of former struggle. In your world, even in the face of the miscarriage of the ordained plans, great progress has been made since the gift to your peoples of Adam's life plasm.
P586:4, 51:5.7 But while the pure-line children of a planetary Garden of Eden can bestow themselves upon the superior members of the evolutionary races and thereby upstep the biologic level of mankind, it would not prove beneficial for the higher strains of Urantia mortals to mate with the lower races; such an unwise procedure would jeopardize all civilization on your world. Having failed to achieve race harmonization by the Adamic technique, you must now work out your planetary problem of race improvement by other and largely human methods of adaptation and control.