There is no gainsaying the fact that conflict has been one of the chief agencies of human progress in the past; but neither can it be disputed that cooperation, or mutual aid, has been of equal importance. Neither attitude can be conceived as primary or dominant; they have interacted throughout the history of mankind. Fundamentally, the problem of the relationship of these two phases of life is much the same as that of the nature and function of good and evil. The one cannot exist without the other, and both are relative terms. Our present thought on these problems has been too largely dominated by a wrong interpretation of the theory of the survival of the fittest as the primary force in human evolution. We have assumed, and the German militarists carried the doctrine to a logical conclusion, that this hypothesis gave the sanction of a biological law to a competitive struggle between men. But such an inference was explicitly denied by Charles Darwin,[15] and has no biological foundation. The struggle he described is between species and not between members of the same species. On the other hand, we find throughout nature that those species have been most successful which have developed the most effective means of mutual aid.[16] Thus our economic and political thought has been dominated for the past two or three generations with a blind worship of the dogma of unrestrained competition, which has no basis of proof either in biological or social science. When we examine what has gone on in the older sections of our country and project the present tendencies into the future, we get a different point of view, and come to see that only by an adjustment of the relations of the village and the farm to each other can the best life of both be secured. We shall have occasion in subsequent chapters to consider the social and political problems involved, but let us here discuss merely the economic relations, which have been the chief source of discord.