He who says he is in the light and hates his brother, is in the darkness even until now. He who loves his brother remains in the light, and there is no occasion for stumbling in him.

1 John 3:14-18

We know that we have passed out of death into life, because we love the brothers. He who does not love remains in death. Whoever hates his brother is a murderer, and you know that no murderer has eternal life remaining in him. By this we know love, because he laid down his life for us. And we ought to lay down our lives for the brothers. read more.
But whoever has the world's goods, and sees his brother in need, and closes his heart of compassion against him, how does the love of God remain in him? Little children, let us not love in word only, neither with the tongue only, but in deed and truth.

1 John 4:7-11

Knowledge » Who does not know God

1 John 4:8

1 John 3:1-6

Behold, how great a love the Father has bestowed on us, that we should be called children of God; and such we are. For this cause the world does not know us, because it did not know him. Beloved, now we are children of God, and it is not yet revealed what we will be. We know that, when he is revealed, we will be like him; for we will see him just as he is. Everyone who has this hope set on him purifies himself, even as he is pure. read more.
Everyone who sins also commits lawlessness. Sin is lawlessness. You know that he was revealed to take away sins, and in him is no sin. Whoever remains in him does not sin. Whoever sins hasn't seen him, neither knows him.

Love » Those that do not love others

1 John 3:10

In this the children of God are revealed, and the children of the devil. Whoever does not do righteousness is not of God, neither is he who does not love his brother.

1 John 4:8

Love » God being love

1 John 4:7-8

Beloved, let us love one another, for love is of God; and everyone who loves is born of God, and knows God. He who does not love does not know God, for God is love.

Love » The source of love

1 John 4:7-21

Beloved, let us love one another, for love is of God; and everyone who loves is born of God, and knows God. He who does not love does not know God, for God is love. By this God's love was revealed in us, that God has sent his one and only Son into the world that we might live through him. read more.
In this is love, not that we have loved God, but that he loved us, and sent his Son as the atoning sacrifice for our sins. Beloved, if God loved us in this way, we also ought to love one another. No one has seen God at any time. If we love one another, God remains in us, and his love has been perfected in us. By this we know that we remain in him and he in us, because he has given us of his Spirit. We have seen and testify that the Father has sent the Son as the Savior of the world. Whoever confesses that Jesus is the Son of God, God remains in him, and he in God. We know and have believed the love which God has for us. God is love, and he who remains in love remains in God, and God remains in him. In this love has been made perfect among us, that we may have boldness in the day of judgment, because as he is, even so are we in this world. There is no fear in love; but perfect love casts out fear, because fear has punishment. He who fears is not made perfect in love. We love, because he first loved us. If a man says, "I love God," and hates his brother, he is a liar; for he who does not love his brother whom he has seen, cannot love God whom he has not seen. This commandment we have from him, that he who loves God should also love his brother.