But he that hateth his brother is in darkness, and walketh in darkness, and knoweth not whither he goeth, because that darkness hath blinded his eyes.

The chief factor in the life of believers is love toward the brethren, and therefore the apostle devotes a special paragraph to its discussion: Beloved, not a new commandment do I write to you, but an old commandment, which you had from the beginning; the old commandment is the Word which you heard. As the apostle of love John addresses his readers in the affectionate manner which gives token of his love. It is not a new, novel, strange, unheard-of commandment that he is writing about, such as would set them all a-wondering as to his motive in speaking to them in this manner. It was an old precept, one which they had heard from the beginning of their Christian life. He was, in other words, expounding to them the Word of God as they had heard it always, from all their teachers; for all the apostles and their assistants preached the same truth.

In spite of the fact, however, that it was the old, old truth which he was proclaiming, he could nevertheless write: Again, a new commandment I am writing to you, what is true in Him and in you, because the darkness is passing away and the true light is even now shining. The truth does not change, it remains the same always. But the apostle says that, from another angle, from another point of view, his doctrine and the special precept which he has in mind is a new commandment. The form in which he is presenting it, the vehemence with which he is insisting upon it, gives it a tang of novelty, arouses new interest for it. The precept is contained in the revelation of Jesus Christ, has been fulfilled in Him, and is proved in the experience of believers. Christ truly loved His brethren and thereby left us an example of true brotherly love. In Him there was never any darkness in this respect or in any other. But in the case of us Christians also it is true that the former darkness of sin and selfishness is passing away, and the true light from God is shining, is illuminating us. Our hearts have been enlightened by the beauty and the power of the grace of God in Christ Jesus, and in this power we are beginning to renew the image of God in our hearts. And although the shadows are still frequent by reason of our sinful nature, we know that they will be fully and finally driven away when the sun of eternal life will arise upon us.

The apostle here inserts a serious warning: He that says he is in the light and yet hates his brother is in darkness until now. He that loves his brother remains in the light, and there is no occasion of stumbling in it; but he that hates his brother is in darkness and walks in darkness, and he does not know where he is going, because the darkness has blinded his eyes. The distinction which the apostle makes is very clear. If a person professes to be a Christian, men have a right to expect a corresponding conduct from him, one which agrees with the will and character of Christ, one which is conspicuous for its show of brotherly love. If brotherly love, therefore, is absent, if there is evidence of hatred, it shows that such a person, in spite of all his protestations, is still in darkness; he is not yet truly converted, faith and hope have no place in his heart. Where a person has and shows real brotherly love, not the cheap imitation which is so often hailed as the genuine thing in our days, such a person is and remains in the light of God's grace, with faith and love in his heart. Being in the light, he is not in danger of stumbling into pitfalls which the guile of the devil and of evil persons may place for him, such as participation in false charity of our days, especially that practiced by the many anti-Christian societies. The Lord cannot bear pretense, deceit, hypocrisy. If any person has hatred toward his brother in his heart, his entire life, all that he does and undertakes, is in the darkness of unbelief and of a false charity. He may attempt to do what genuine Christians are doing, but because the light of faith has not arisen in his heart, because the eyes of his understanding are not yet enlightened, because he has no judgment in spiritual matters, therefore all his efforts are futile, they lead him nowhere so far as real Christianity is concerned, they have no worth in the sight of God so far as true sanctification is demanded. What a powerful appeal to all Christians to strive for purity of brotherly love on the basis of justifying and sanctifying faith!

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