It so happens, however, that the capacity of the human brain is limited, and a single brain is not made to hold together the idea of Socialism and the idea of Individualism. Ordinary people have, it is true, no practical difficulty whatever in acting concurrently in accordance with the ideas of Socialism and of Individualism. But it is different with the men of ideas; they must either be Socialists or Individualists; they cannot be both. The tendency in one or the other direction is probably inborn in these men of ideas. We need not regret this inevitable division of labour. On the contrary, it is difficult to see how the right result could otherwise be brought about. People without ideas experience no difficulty in harmonizing the two tendencies. But if the ideas of Socialism and Individualism tended to appear in the same brain they would neutralize each other or lead action into an unprofitable _via media_. The separate initiative and promulgation of the two tendencies encourages a much more effective action, and best promotes that final harmony of the two extremes which the finest human development needs. There is more to be said. Not only are both alike indispensable, and both too profoundly rooted in human nature to be abolished or abridged, but each is indispensable to the other. There can be no Socialism without Individualism; there can be no Individualism without Socialism. Only a very fine development of personal character and individual responsibility can bear up any highly elaborated social organization, which is why small Socialist communities have only attained success by enlisting finely selected persons; only a highly organized social structure can afford scope for the play of individuality. The enlightened Socialist nowadays often realizes something of the relationship of Socialism to Individualism, and the Individualist--if he were not in recent times, for all his excellent qualities, sometimes lacking in mental flexibility and alertness--would be prepared to admit his own relationship to Socialism. "The organization of the whole is dominated by the necessities of cellular life," as Dareste says. That truth is well recognized by the physiologists since the days of Claude Bernard. It is absolutely true of the physiology of society. Social organization is not for the purpose of subordinating the individual to society; it is as much for the purpose of subordinating society to the individual.