12 This is the law I give you: Have love one for another, even as I have love for you.
My loved ones, I do not give you a new law, but an old law which you had from the first; this old law is the word which came to your ears. Again, I give you a new law, which is true in him and in you; for the night is near its end and the true light is even now shining out. He who says that he is in the light, and has hate in his heart for his brother, is still in the dark. He who has love for his brother is in the light, and there is no cause of error in him.
Because this is the word which was given to you from the first, that we are to have love for one another; Not being of the Evil One like Cain, who put his brother to death. And why did he put him to death? Because his works were evil and his brother's works were good. Do not be surprised, my brothers, if the world has no love for you. We are conscious that we have come out of death into life because of our love for the brothers. He who has no love is still in death. Anyone who has hate for his brother is a taker of life, and you may be certain that no taker of life has eternal life in him. In this we see what love is, because he gave his life for us; and it is right for us to give our lives for the brothers. But if a man has this world's goods, and sees that his brother is in need, and keeps his heart shut against his brother, how is it possible for the love of God to be in him? My little children, do not let our love be in word and in tongue, but let it be in act and in good faith.
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Commentary on John 15 Matthew Henry Commentary
Chapter 15
It is generally agreed that Christ's discourse in this and the next chapter was at the close of the last supper, the night in which he was betrayed, and it is a continued discourse, not interrupted as that in the foregoing chapter was; and what he chooses to discourse of is very pertinent to the present sad occasion of a farewell sermon. Now that he was about to leave them,
Jhn 15:1-8
Here Christ discourses concerning the fruit, the fruits of the Spirit, which his disciples were to bring forth, under the similitude of a vine. Observe here,
Jhn 15:9-17
Christ, who is love itself, is here discoursing concerning love, a fourfold love.
To induce them to keep his commandments, he urges,
Jhn 15:18-25
Here Christ discourses concerning hatred, which is the character and genius of the devil's kingdom, as love is of the kingdom of Christ. Observe here,
Jhn 15:26-27
Christ having spoken of the great opposition which his gospel was likely to meet with in the world, and the hardships that would be put upon the preachers of it, lest any should fear that they and it would be run down by that violent torrent, he here intimates to all those that were well-wishers to his cause and interest what effectual provision was made for supporting it, both by the principal testimony of the Spirit (v. 26), and the subordinate testimony of the apostles (v. 27), and testimonies are the proper supports of truth.