1 John 4:8

“He that loveth not, knoweth not God, &c.] If a man loves not the children of God, those that are born of him, he does not know, so as to love God, the Father of them; for to pretend love to God, the begetter of them, whom he sees not, and not love those who are begotten by him, and are visible objects of respect, is a contradiction, and cannot be reconciled: (see <620420>1 John 4:20). This clause is left out in the Ethiopic version, and is transposed in the Syriac version, which reads the text thus, “for God, is love, and whoever loveth not, knoweth not God”. By which reading, the following reason stands in close connection with (<620407>1 John 4:7). For God is love; he loves himself; there…”

“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.”

“He that loveth not, knoweth not God - Has no true acquaintance with God; has no just views of him, and no right feelings toward 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 the notes at 2 Corinthians 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…”

“God is love - This little sentence brought St. John more sweetness, even in the time he was writing it, than the whole world can bring. God is often styled holy, righteous, wise; but not holiness, righteousness, or wisdom in the abstract, as he is said to be love; intimating that this is his darling, his reigning attribute, the attribute that sheds an amiable glory on all his other perfections. 1 John 4:12”

“4:8 God is love, the source and embodiment of all love. This concept and the concept that “God is light” (1:5) form the foundation on which John writes this letter.”

“knoweth: Jo1 2:4, Jo1 2:9, Jo1 3:6; Joh 8:54, Joh 8:55 God is: Jo1 1:5; Exo 34:6, Exo 34:7; Psa 86:5, Psa 86:15; Co2 13:11; Eph 2:4; Heb 12:29 1 John 4:9”