As human beings, our main field of duty lies in promoting social advance. To maintain ourselves and our families is an animal duty we share with the other animals; to maintain each other, and, by so doing to increase our social efficiency, is human duty, first, last, and always. We have always seen the necessity for social groups, religious, political, and other; we have more or less fulfilled our social functions therein; but we have in the main supposed that all this common effort was merely for the greater safety and happiness of homes; and when the interests of the home and those of the state clashed, most of us have put home first.
The first person to learn better was that very earliest of social servants, the soldier. He learned first of all to combine for the common good, and though his plane of service was the lowest of all, mere destruction, the group sentiments involved were of the highest order. The destructive belligerence of the male, and his antecedent centuries of brute combat, made fighting qualities most prominent; but the union and organisation required for successful human warfare called out high social qualities, too. The habit of acting together necessarily develops in the brain the power and desire to act together; the fact that success or failure, life or death, advantage or injury, depends on collective action, necessarily develops the social consciousness. This modification we find in the army everywhere, gradually increasing with race-heredity; and, long since, so far overwhelming the original egoism of the individual animal, that the common soldier habitually sacrifices his life to the public service without hesitation.
The steps in social evolution must always be made in this same natural order, from one stage of development to another, by means of existing qualities. Primitive man had no altruism, he had no honour, his courage was flickering and wholly personal; he had no sense of order and discipline, of self-control and self-sacrifice; but he had a strong inclination to fight, and by means of that one tendency he was led into relations which developed all those other qualities.
It is easy to see that this stage of our social development was diametrically opposed by the home. The interests of the home demanded personal service; the habits of the home bred industry and patience; the influence of the inmates of the home, of the women and children, did not promote martial qualities. So our valorous ancestor promptly left home and went a-fighting, for thousands and thousands of years, while human life was maintained by the women at home.