At the same time, the evolution theory enables us to see plainly a cause at work which would inevitably produce in human minds the illusion that existence is good. Just as any species of animals which found a pleasure in actions ultimately entailing the destruction of the species would be condemned to extinction, so too only those varieties of the genus homo could survive in whom the conviction of the goodness and desirability of existence was strong enough to call forth the activities on which existence was dependent.
The optimistic interpretation of evolution is based on the "struggle for life" theory that "existence" sums up the good for which man struggles; and we have sought to show that the optimism which is based on this assumption must result in the conclusion that progress is an illusion. Some readers, however, may hold that mere existence is not the only good that man is capable of struggling for.
III.
PESSIMISM
"The prospect of attaining untroubled happiness, or of a state which can, even remotely, deserve the title of perfection, appears to me to be as misleading an illusion as ever was dangled before the eyes of poor humanity. And there have been many of them."[1]
The theory which sees in evolution nothing but the redistribution of matter and motion leads to an optimistic view of things which on examination proves to be a misleading illusion. From illusion to pessimism is but a step.
The facts on which the theory of organic evolution is based are two. The first is that no two individuals of any species are born exactly alike; and that of two different individuals one must be superior to the other, i.e. better fitted to survive under the conditions then and there prevailing. The next is that parents transmit their qualities to offspring; and the superiority of superior parents is thus transmitted and accumulated from generation to generation. Organic evolution, therefore, consists in more and more perfect adaptation of the organism to the environment. And this adaptation is effected by the physical destruction of those creatures which are weakly and not adapted to cope with the environment.
According to the theory that evolution is progress, the progress or evolution of humanity obeys the same laws, is impelled by the same forces, and follows the same line as the evolution of organisms in general; and consists accordingly in increasing adaptation to the environment. Imperfect adaptation manifests itself whenever a man's impulses or desires move him to perform acts which are immediately or eventually prejudicial to his own or to society's existence. Adaptation will be perfect when all acts which are necessary for the existence of the individual and of the society are pleasant in themselves—when not only going to the dentist's will be a duty, but the extraction will be a pleasure desired for its own sake.
Though Mr. Huxley maintained that it was a misleading illusion to lead people to expect any such state of untroubled happiness, he was far from denying that progress has been made in the past by man, or from despairing of further progress in the future. But progress does not, according to him, consist in adaptation to environment; it is not effected by means of the struggle for existence; it neither obeys the same laws, nor is impelled by the same forces, nor follows the same lines as organic evolution in general. Nor does it consist in the substitution of personal pleasure for a sense of duty as the motive of action: on the contrary, it consists in a fuller and fuller recognition of the claims of others.