1 John 4:8

8. knoweth not--Greek aorist: not only knoweth not now, but never knew, has not once for all known God. God is love--There is no Greek article to love, but to God; therefore we cannot translate, Love is God. God is fundamentally and essentially LOVE: not merely is loving, for then John's argument would not stand; for the conclusion from the premises then would be this, This man is not loving: God is loving; therefore he knoweth not God IN SO FAR AS God is loving; still he might know Him in His other attributes. But when we take love as God's essence, the argument is sound: This man doth not love, and therefore knows not love: God is essentially love, therefore he knows not God.

Robert Jamieson, A. R. Fausset & David Brown, 1871 · public domain

Verse 8. He that loveth not, knoweth not God. Has no true acquaintance with God; has no just views of him, and no right feelings towards him. The reason for this is implied in what is immediately stated, that "God is love," and of course if they have no love reigning in their hearts they cannot pretend to be like him.

For God is love. He is not merely benevolent, he is benevolence itself. Compare 2Cor 13:11. Never was a more important declaration made than this; never was more meaning crowded into a few words than in this short sentence--God is love. In the darkness of this world of sin--in all the sorrows that come now upon the race, and that will come upon the wicked hereafter--we have the assurance that a God of infinite benevolence rules over all; and though we may not be able to reconcile all that occurs with this declaration, or see how the things which he has permitted to take place are consistent with it, yet in the exercise of faith on his own declarations we may find consolation in believing that it is so, and may look forward to a period when all his universe shall see it to be so. In the midst of all that occurs on the earth of sadness, sin, and sorrow, there are abundant evidences that God is love. In the original structure of things before sin entered, when all was pronounced "good;" in the things designed to promote happiness, where the only thing contemplated is happiness, and where it would have been as easy to have caused pain; in the preservation of a guilty race, and in granting that race the opportunity of another trial; in the ceaseless provision which God is making in his providence for the wants of unnumbered millions of his creatures; in the arrangements made to alleviate sorrow, and to put an end to it; in the gift of a Saviour more than all, and in the offer of eternal life on terms simple and easy to be complied with--in all these things, which are the mere expressions of love, not one of which would have been found under the government of a malignant being, we see illustrations of the sublime and glorious sentiment before us, that "God is love." Even in this world of confusion, disorder, and darkness, we have evidence sufficient to prove that he is benevolent, but the full glory and meaning of that truth will be seen only in heaven. Meantime let us hold on to the truth that he is love. Let us believe that he sincerely desires our good, and that what seems dark to us may be designed for our welfare; and amidst all the sorrows and disappointments of the present life, let us feel that our interests and our destiny are in the hands of the God of love.

(a) "love" 1Jn 4:16, 2Cor 13:11

Albert Barnes, 1834 · public domain

Verse 8 He that loveth not - As already described, knoweth not God - has no experimental knowledge of him. God is love - An infinite fountain of benevolence and beneficence to every human being. He hates no thing that he has made. He cannot hate, because he is love. He causes his sun to rise on the evil and the good, and sends his rain on the just and the unjust. He has made no human being for perdition, nor ever rendered it impossible, by any necessitating decree, for any fallen soul to find mercy. He has given the fullest proof of his love to the whole human race by the incarnation of his Son, who tasted death for every man. How can a decree of absolute, unconditional reprobation, of the greater part or any part of the human race, stand in the presence of such a text as this? It has been well observed that, although God is holy, just, righteous, etc., he is never called holiness, justice, etc., in the abstract, as he is here called Love. This seems to be the essence of the Divine nature, and all other attributes to be only modifications of this.

Adam Clarke, 1831 · public domain