41 My loved ones, do not put your faith in every spirit, but put them to the test, to see if they are from God: because a great number of false prophets have gone out into the world. 2 By this you may have knowledge of the Spirit of God: every spirit which says that Jesus Christ has come in the flesh is of God: 3 And every spirit which does not say this is not from God: this is the spirit of Antichrist, of which you have had word; and it is in the world even now.
4 You are of God, my little children, and you have overcome them because he who is in you is greater than he who is in the world. 5 They are of the world, so their talk is the world's talk, and the world gives ear to them. 6 We are of God: he who has the knowledge of God gives ear to us; he who is not of God does not give ear to us. By this we may see which is the true spirit, and which is the spirit of error.
7 My loved ones, let us have love for one another: because love is of God, and everyone who has love is a child of God and has knowledge of God. 8 He who has no love has no knowledge of God, because God is love. 9 And the love of God was made clear to us when he sent his only Son into the world so that we might have life through him. 10 And this is love, not that we had love for God, but that he had love for us, and sent his Son to be an offering for our sins. 11 My loved ones, if God had such love for us, it is right for us to have love for one another. 12 No man has ever seen God: if we have love for one another, God is in us and his love is made complete in us: 13 And his Spirit which he has given us is the witness that we are in him and he is in us.
Matthew Henry's Commentary on 1 John 4:1-13
Commentary on 1 John 4:1-6
(Read 1 John 4:1-6)
Christians who are well acquainted with the Scriptures, may, in humble dependence on Divine teaching, discern those who set forth doctrines according to the apostles, and those who contradict them. The sum of revealed religion is in the doctrine concerning Christ, his person and office. The false teachers spake of the world according to its maxims and tastes, so as not to offend carnal men. The world approved them, they made rapid progress, and had many followers such as themselves; the world will love its own, and its own will love it. The true doctrine as to the Saviour's person, as leading men from the world to God, is a mark of the spirit of truth in opposition to the spirit of error. The more pure and holy any doctrine is, the more likely to be of God; nor can we by any other rules try the spirits whether they are of God or not. And what wonder is it, that people of a worldly spirit should cleave to those who are like themselves, and suit their schemes and discourses to their corrupt taste?
Commentary on 1 John 4:7-13
(Read 1 John 4:7-13)
The Spirit of God is the Spirit of love. He that does not love the image of God in his people, has no saving knowledge of God. For it is God's nature to be kind, and to give happiness. The law of God is love; and all would have been perfectly happy, had all obeyed it. The provision of the gospel, for the forgiveness of sin, and the salvation of sinners, consistently with God's glory and justice, shows that God is love. Mystery and darkness rest upon many things yet. God has so shown himself to be love, that we cannot come short of eternal happiness, unless through unbelief and impenitence, although strict justice would condemn us to hopeless misery, because we break our Creator's laws. None of our words or thoughts can do justice to the free, astonishing love of a holy God towards sinners, who could not profit or harm him, whom he might justly crush in a moment, and whose deserving of his vengeance was shown in the method by which they were saved, though he could by his almighty Word have created other worlds, with more perfect beings, if he had seen fit. Search we the whole universe for love in its most glorious displays? It is to be found in the person and the cross of Christ. Does love exist between God and sinners? Here was the origin, not that we loved God, but that he freely loved us. His love could not be designed to be fruitless upon us, and when its proper end and issue are gained and produced, it may be said to be perfected. So faith is perfected by its works. Thus it will appear that God dwells in us by his new-creating Spirit. A loving Christian is a perfect Christian; set him to any good duty, and he is perfect to it, he is expert at it. Love oils the wheels of his affections, and sets him on that which is helpful to his brethren. A man that goes about a business with ill will, always does it badly. That God dwells in us and we in him, were words too high for mortals to use, had not God put them before us. But how may it be known whether the testimony to this does proceed from the Holy Ghost? Those who are truly persuaded that they are the sons of God, cannot but call him Abba, Father. From love to him, they hate sin, and whatever disagrees with his will, and they have a sound and hearty desire to do his will. Such testimony is the testimony of the Holy Ghost.