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The Meaning of Evolution: A Study of the History of Life and of Its Significance for Man, Revised Edition (The Terry Lectures Series) Paperback – September 10, 1967
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He states in the Prologue, "I take it as now self-evident, requiring no further special discussion, that evolution and TRUE religion are compatible. It is also sufficiently clear that science, alone, does not reach all truths, plumb all mysteries, or exhaust all values and that the place and need for true religion is still very much with us."
He observes, "New major sorts of organisms have arisen, as a rule, not as more effective followers of ways of life already occupied but as groups extending into and eventually filling new ways." He adds later, "It is noteworthy that such replacement is usually an approximate, not an exact, duplication of earlier ways of life. Conditions change and groups of later origin are never quite like those of earlier ages. Bats are only broadly, and not closely similar in habits to some, and not to all, pterodactyls."
Concerning the evolution of the eye, he states, "In fact, representative stages at every gradually different level happen to have survived, from diffuse photosensitivity of the whole body through scattered photosensitive cells to cell plates, basins, basins and vesicles plus lenses, and so on to the fully developed image-forming eye with lens, iris, and its other complexities. These photoreceptors function splendidly at every level and do not wait to start working until the final stage is reached. They simply enlarge, refine, and to some extent change their functions as they become more complex."
He muses, "it is quickly evident that there is no criterion of progress by which progress can be considered a universal phenomenon of evolution ... To find that progress is universal would certainly be far more surprising than to find that it is only occasional." He suggests, "Man has risen, not fallen. He can choose to develop his capacities as the highest animal and to try to rise still farther, or he can choose otherwise. The choice is his responsibility, and his alone.... Evolution has no purpose; man must supply this for himself." He concludes the book on the note, "It is another unique quality of man that he, for the first time in the history of life, has increasing power to choose his course and to influence his own future evolution ... Responsibility for defining and for seeking that end belongs to all of us."