He that says he is in the light, and hates his brother, is in darkness even until now. He that loves his brother abides in the light, and there is no occasion of stumbling in him.

1 John 3:14-18

We know that we have passed from death unto life, because we love the brethren. He that loves not his brother abides in death. Whosoever hates his brother is a murderer: and you know that no murderer has eternal life abiding in him. By this perceive we the love of God, because he laid down his life for us: and we ought to lay down our lives for the brethren. read more.
But whoever has this world's goods, and sees his brother have need, and shuts up his heart of compassion from him, how dwells the love of God in him? My little children, let us not love in word, neither in tongue; but in deed and in truth.

1 John 4:7-11

Knowledge » Who does not know God

1 John 4:8

1 John 3:1-6

Behold, what manner of love the Father has bestowed upon us, that we should be called the children of God: therefore the world knows us not, because it knew him not. Beloved, now are we the children of God, and it does not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is. And every man that has this hope in him purifies himself, even as he is pure. read more.
Whosoever commits sin transgresses also the law: for sin is the transgression of the law. And you know that he was manifested to take away our sins; and in him is no sin. Whosoever abides in him sins not: whosoever sins has not seen him, neither known him.

Love » Those that do not love others

1 John 3:10

In this the children of God are manifest, and the children of the devil: whosoever does not righteousness is not of God, neither he that loves not 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 that loves is born of God, and knows God. He that loves not knows not 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 that loves is born of God, and knows God. He that loves not knows not God; for God is love. In this was manifested the love of God toward us, because God sent his only begotten Son into the world, that we might live through him. read more.
In this is love, not that we loved God, but that he loved us, and sent his Son to be the propitiation for our sins. Beloved, if God so loved us, we ought also to love one another. No man has seen God at any time. If we love one another, God dwells in us, and his love is perfected in us. By this we know that we dwell in him, and he in us, because he has given us of his Spirit. And we have seen and do testify that the Father sent the Son to be the Savior of the world. Whosoever shall confess that Jesus is the Son of God, God dwells in him, and he in God. And we have known and believed the love that God has for us. God is love; and he that dwells in love dwells in God, and God in him. In this is our love made perfect, that we may have boldness in the day of judgment: because as he is, so are we in this world. There is no fear in love; but perfect love casts out fear: because fear has to do with punishment. He that fears is not made perfect in love. We love him, because he first loved us. If a man says, I love God, and hates his brother, he is a liar: for he that loves not his brother whom he has seen, how can he love God whom he has not seen? And this commandment have we from him, That he who loves God love his brother also.