There is no truth coming more determinedly to the front in our own day than this: that society is an organism similar to the human body. This indeed is no new idea, nor is it an exclusively Christian idea. That man was made for society and that it was each man's business to labour for the good of the whole was common Stoic doctrine. It was taught that every man should believe himself to be born, not for himself, but for the whole world. Take one out of many expressions of this truth: "You have seen a hand cut off, or a foot, or a head, lying apart from the rest of the body; that is what a man makes himself when he separates himself from others or does anything unsocial. You were made by nature a part; and it is due to the benevolence of God that, if you have become detached from the whole, you can be reunited to it." And in the very earliest days, when the populace of Rome became disaffected and seditious and retired outside the city walls to a camp of their own, Menenius Agrippa went out to them and uttered his fable which Shakespeare has helped to make famous. He related how the various members of the body--the hand, the eye, the ear--mutinied and refused to work any longer because it seemed to them that all the food and enjoyment for which they toiled went to another member, and not to them. It was of course easy for the accused member to clear itself of the charge of inactivity and show that the food it received was not retained for its own exclusive use, but was distributed through the rivers of the blood, and how "the strongest nerves and small inferior veins" from it received the natural competency whereby they lived.
But although this comparison of society to the body is not new, it is now being more seriously and scientifically examined and pushed to its legitimate conclusions and applications. The "real meaning of the doctrine that society is an organism is that an individual has no life except that which is social, and that he cannot realize his own purposes except in realizing the larger purposes of society." All the organs of the body by which we do our work in the world and earn our bread are themselves maintained in life and fulfil the end of their own existence by working for and maintaining the whole body; and except in the common life of the body they cannot be maintained at all. It is the same with the other organs of the body. The heart, the lungs, the digestive organs, have hard and constant work to do; but only by doing it can they fulfil the very purpose of their existence and maintain themselves in life by contributing to the life of the body in which alone they can live at all. The same principle holds good in society. It is obvious in trade and commerce; a man can only maintain himself in life by helping to maintain other people. And the ideal society is one in which each man should not only yield reluctantly to the compulsion of this natural law, but should clearly see the great ends for which mankind exists and labour zealously to promote these ends, should as eagerly seek what contributes to the good of the whole as the hand is stretched out for food or as the palate relishes what stays the appetite and nourishes the whole body.
Illustrating the relation of Christians to one another by the figure of the members of a body, Paul suggests several ideas.
1. The unity of Christians is a vital unity. The members of the body of Christ form one whole because they partake of one common life. "By one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit." The unity of those who together form the body of Christ is not a mechanical unity, as of a pound of shot in a bag; nor is it a unity imposed by external force, as of caged wild beasts in a menagerie; nor is it a unity of mere accidental juxtaposition, as of passengers in a train or of the inhabitants of a town. But as the life of the human body maintains all the various members and nourishes them to a well-proportioned and harmonious growth, so is it in the body of Christ. Remove from the human body the life that supports it, and all the members fall away from connection with one another; but so long as the life is retained it assimilates in the most surprising way all nutriment to its own precise type and form. The lion and the tiger may eat precisely the same food, but that food nourishes in each a different form. The life that animates the human body assimilates nutriment to its own uses, imparting to each member its due proportion and maintaining all the members in their relation to one another.