He who says that he is in the light, and hates his brother, is in the 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 out of death into life, because we love the brethren. He that loves not abides in death. Every one that hates his brother is a murderer; and ye know that no murderer has eternal life abiding in him. In this we have known the love, that He laid down His soul in our behalf; and we ought to lay down our souls in behalf of the brethren. read more.
But whosoever possesses the goods of the world, and beholds his brother having need, and shuts up his compassion from him, how does the love of God abide in him? Little children, let us not love in word, neither with the 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 hath given to us, that we should be called children of God; and such we are. For this cause the world knows us not, because it knew Him not. Beloved, now are we children of God, and never yet was it manifested what we shall be. We know that, if He shall be manifested, we shall be like Him, because we shall see Him as He is. And every one that has this hope on Him purifies himself, even as He is pure. read more.
Every one who commits sin commits lawlessness also; and sin is lawlessness. And ye know that He was manifested, that He might take away sins; and in Him is no sin. Every one that is abiding in Him sins not; whosoever sins has not seen Him nor known Him.

Love » Those that do not love others

1 John 3:10

In this are manifest the children of God and the children of the Devil: every one that does not righteousness is not of God, neither he that does not love his brother;

1 John 4:8

Love » God being love

1 John 4:7-8

Beloved, let us love one another; because love is of God, and every one that loves has been begotten of God, and knows God. He that loves not never knew God; because God is love.

Love » The source of love

1 John 4:7-21

Beloved, let us love one another; because love is of God, and every one that loves has been begotten of God, and knows God. He that loves not never knew God; because God is love. In this was manifested the love of God in us, that God hath sent His only begotten Son into the world, that we may live through Him. read more.
Herein is love, not that we loved God, but that He loved us, and sent His Son, to be a propitiation for our sins. Beloved, if God so loved us, we also ought to love one another. No one has ever beheld God. If we love one another, God abideth in us, and His love has been perfected in us. In this we know that we abide in Him, and He in us, because He hath given us of His Spirit. And we have beheld, and testify, that the Father hath sent the Son, as Savior of the world. Whosoever confesses that Jesus is the Son of God, God abideth in Him, and he in God. And we have known and believed the love which God hath in us. God is love, and he that abides in love abides in God, and God abideth in him. In this has love been made perfect with us, that we may have confidence 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; and he who fears is not made perfect in love. We love, because He first loved us. If anyone says, "I love God," and hates his brother, he is a liar; for he that loves not his brother whom he has seen, cannot love God Whom he has not seen. And this commandment we have from Him, that he who loves God loves his brother also.