P733:7, 65:3.1 It will hardly be possible to explain to the present-day human mind many of the queer and apparently grotesque occurrences of early evolutionary progress. A purposeful plan was functioning throughout all of these seemingly strange evolutions of living things, but we are not allowed arbitrarily to interfere with the development of the life patterns after they have once been set in operation.
P733:8, 65:3.2 Life Carriers may employ every possible natural resource and may utilize any and all fortuitous circumstances which will enhance the developmental progress of the life experiment, but we are not permitted mechanically to intervene in, or arbitrarily to manipulate the conduct and course of, either plant or animal evolution.
P733:9, 65:3.3 You have been informed that Urantia mortals evolved by way of primitive frog development, and that this ascending strain, carried in potential in a single frog, narrowly escaped extinction on a certain occasion. But it should not be inferred that the evolution of mankind would have been terminated by an accident at this juncture. At that very moment we were observing and fostering no less than one thousand different and remotely situated mutating strains of life which could have been directed into various different patterns of prehuman development. This particular ancestral frog represented our third selection, the two prior life strains having perished in spite of all our efforts toward their conservation.
P734:1, 65:3.4 Even the loss of Andon and Fonta before they had offspring, though delaying human evolution, would not have prevented it. Subsequent to the appearance of Andon and Fonta and before the mutating human potentials of animal life were exhausted, there evolved no less than seven thousand favorable strains which could have achieved some sort of human type of development. And many of these better stocks were subsequently assimilated by the various branches of the expanding human species.
P734:2, 65:3.5 Long before the Material Son and Daughter, the biologic uplifters, arrive on a planet, the human potentials of the evolving animal species have been exhausted. This biologic status of animal life is disclosed to the Life Carriers by the phenomenon of the third phase of adjutant spirit mobilization, which automatically occurs concomitantly with the exhaustion of the capacity of all animal life to give origin to the mutant potentials of prehuman individuals.
P734:3, 65:3.6 Mankind on Urantia must solve its problems of mortal development with the human stocks it has -- no more races will evolve from prehuman sources throughout all future time. But this fact does not preclude the possibility of the attainment of vastly higher levels of human development through the intelligent fostering of the evolutionary potentials still resident in the mortal races. That which we, the Life Carriers, do toward fostering and conserving the life strains before the appearance of human will, man must do for himself after such an event and subsequent to our retirement from active participation in evolution. In a general way, man's evolutionary destiny is in his own hands, and scientific intelligence must sooner or later supersede the random functioning of uncontrolled natural selection and chance survival.
P734:4, 65:3.7 And in discussing the fostering of evolution, it would not be amiss to point out that, in the long future ahead, when you may sometime be attached to a corps of Life Carriers, you will have abundant and ample opportunity to offer suggestions and make any possible improvements in the plans and technique of life management and transplantation. Be patient! If you have good ideas, if your minds are fertile with better methods of administration for any part of the universal domains, you are certainly going to have an opportunity to present them to your associates and fellow administrators in the ages to come.