These words of John give us the key to the expression "taught of God to love one another." It is not likely that they refer to anything so external as the words of Scripture, "Thou shalt love thy neighbour as thyself." Even in the Old Testament, to be taught of God was something more spiritual than this; it was the same thing as to have the law written on the heart. That is what the Apostle has in view here. The Christian has been born again, born of God; he has a new nature, with new instincts, a new law, a new spontaneity; it is now native to him to love. Until the Spirit of God enters into men's hearts and recreates them, life is a war of all against all; man is a wolf to man; but in the Church that internecine strife has ended, for its members are the children of God, and every one that loveth Him that begat loveth him also that is begotten of Him. The selfishness of man's nature is veiled, and to some extent repressed, in other societies; but it is not, as a principle, exterminated except in the Church and by the Spirit of Christ. A family ought to be an unselfish place, ruled only by and fostering the spirit of love; yet if Christ be not there, what selfish passions assert themselves in spite of all restraint. Any association working for the common good--a town council even--ought to be an unselfish body; yet how often, in such places, is rivalry conspicuous and self-seeking, and envy, and detraction, and all that is unlike Christ. In the Church which has been taught of God, or, in other words, which has learned of Christ, we find at least some manifestations of a better spirit. It does contain people who love one another because they are Christians; who are unselfish, giving way to each other, esteeming each other, helping each other; if it contained none such, it would not be a Church at all.
The brotherly love of the early Church was not only visible to the world; it was its great recommendation in the world's eyes. It had brought a new thing into being, a thing for which the world was pining, namely, vital society. The poor people in the cities of Asia and Europe saw with wonder, joy, and hope, men and women united to one another in a spiritual union, which gave scope to all their gifts for society, and satisfied all their desires for it. The early Christian churches were little companies of people where love was at a high temperature, where outward pressure very often tightened the inward bonds, and where mutual confidence diffused continual joy. Men were drawn to them irresistibly by the desire to share this life of love. It is the very same force which at this moment draws those who are outcasts from society into the Salvation Army. Whatever the failings of that organisation may be, its members are as brothers; the sense of union, of mutual obligation, of mutual confidence, in one word, of brotherly love, is very strong; and souls that pine for that atmosphere are drawn to it with overpowering force. It is not good for man to be alone; it is vain for him to seek the satisfaction of his social instincts in any of the casual, selfish, or sinful associations by which he is often betrayed: even the natural affection of the family, pure and strong as it may be, does not answer to the width of his spiritual nature; his heart cries out for that society founded on brotherly love which only the Church of Christ provides. If there is one thing more than another which explains the Church's failure in missionary work, it is the absence of this spirit of love among her members. If men were compelled to cry still, as in the early days of the gospel, "Behold these Christians, how they love one another," they would not be able to remain outside. Their hearts would kindle at the glow, and all that hindered their incorporation would be burned up.