If we wish for analogies to illustrate this relation we must look for them among other cases of distinct but complementary organisms living together in interaction and mutual adaptation, such as man and wife in the family, the nervous and alimentary systems in the body, the state and the church in the social system of mediæval Europe, or the national and State governments in the American commonwealth—organisms which may be regarded either as two or as one, according to the purpose in hand. There may be a kind of conflict between the biological and the social currents of life, just as there may between almost any two factors in a co-operative whole. Men of genius, for example, rarely leave a normal number of descendants; they develop themselves socially at the expense of reproduction, though, if there is anything in Mr. Galton’s views, reproduction is, in their case, peculiarly desirable.[51] The same is perhaps true in general of the more intellectual and ambitious types of men: it might be better for the race stock if they put more of their energy into raising families and less into social achievement. At least, this would be the immediate result: in the long run perhaps the social achievement will indirectly contribute to improve the stock. A rather striking example of opposition is found in the monastic system. There is little doubt that this sprang from profound needs of the human spirit and, at its best, played a great part in the higher life. But if its social working was good its effect upon the race is believed to have been detrimental, since for centuries it selected the most intellectual and aspiring men and prevented their leaving offspring. Just as hereditary stocks may flourish although bad for society, so social movements may prosper that are bad for heredity. The practical truth of the matter, from a moral standpoint, may largely be contained in the statement that we get capacity from heredity, conduct from society. The critical thing in the latter is the use that is made of hereditary powers, whether they are to work upward or downward, as judged by social standards. While it is true that no amount or kind of education will take the place of initial capacity, it is true also that there is no source of right development and function except social teaching; the best heredity is powerless in this regard.