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Although many details remain to be worked out, it is already evident that all the objective phenomena of the history of life can be explained by purely materialistic factors. They are readily explicable on the basis of differential reproduction in populations (the main factor in the modem conception of natural selection) and of the mainly random interplay of the known processes of heredity. Vitalist and finalist theories not only fail to explain them but are also flatly inconsistent with them. These theories are commonly not truly explanatory but are frequently more or less veiled attempts to evade explanation. They arose in part as efforts to salvage unscientific prejudices really, contradicted by the facts of evolution, but some were also legitimate reactions to the fact that proposed materialistic explanations were long unsatisfactory and that the effort to complete them was in a temporary impasse. Discovery of the facts of genetics and integration of these with knowledge of life from other fields of study have led out of this impasse and produced a materialistic theory that no longer gives motive for vitalistic or finalistic evasions.
All-over progress, and particularly progress towards any goal or fixed point, can no longer be considered as characteristic of evolution or even as inherent in it. P,rogress does not exist in the history of life, but it is of many different sorts and each sort occurs separately in many different lines. One . so of progress in structure and function that stands out as particularly widespread and important is increasing awareness of the life situation of the individual organism and increasing variety and sureness of appropriate reactions to this. Among the many different lines that show progress in this respect, the line leading to man reaches much the highest level yet developed. By most other criteria of progress, also, man is at least among the higher animals and a balance of considerations fully warrants considering him definitely the highest of all.
Man is the result of a purposeless and materialistic process that did not have him in mind. He was not planned. He is a state of matter, a form of life, a sort of animal, and a species of the Order Primates, akin nearly or remotely to all of life and indeed to all that is. material. It is,. however, a gross misrepresentation to say that he is just an accident or nothing but an animal. Among all the myriad forms of matter and of life on earth or as far as we know in the universe, man is unique. He happens to represent the highest form of organization of matter and energy that has ever appeared. Recognition of this kinship with the rest of the universe is necessary for understanding him, but his essential nature is defined by qualities found nowhere else, not by those he has in common with apes, fishes, trees, fire, or anything other than himself.
It is part of this unique status that in man a new form of evolution begins, overlying and largely dominating the old, organic evolution which nevertheless also continues in him. This new form of evolution works in the social structure, as the old evolution does in the breeding population structure, and it depends on learning, the inheritance of knowledge, as the old does on physical inheritance. Its possibility arises from man's intelligence and associated flexibility of response. His reactions depend far less than other organisms' on physically inherited factors, far more on learning and on perception of immediate and, of new situations. This flexibility brings with it the power and need for constant choice between different courses of action. Man plans and has purposes. Plan, purpose, goal, all absent in evolution to this point, enter with the coming of man and are inherent.in the new evolution, which--is confined to him. With these comes the need for criteria of choice. Good and evil, right or wrong; concepts largely irrelevant in nature except from the human viewpoint, become real and pressing features of the whole cosmos as viewed by man the only possible way in which the cosmos can be viewed morally because morals arise only in man.
Discovery that the universe apart from man or before his coming lacks and lacked ady purpose or plan has the inevitable corollary that the workings of the universe cannot provide any automatic, universal, eternal, or absolute ethical criteria of right and wrong. This discovery has completely undermined all older attempts to find an intuitive ethic or to accept such an ethic as revelation. It has not been so generally recognized that it equally undermines attempts to find a naturalistic ethic, which will flow with absolute validity from the workings of Nature or of Evolution as a new Revelation. Such attempts, arising from discovery of the baselessness of intuitive ethics, have commonly fallen into the same mistake of seeking an absolute ethic or one outside of man's own nature and have been doomed to failure by their own premises.
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