The one who says he is in the light but still hates his fellow Christian is still in the darkness. The one who loves his fellow Christian resides in the light, and there is no cause for stumbling in him.

1 John 3:14-18

We know that we have crossed over from death to life because we love our fellow Christians. The one who does not love remains in death. Everyone who hates his fellow Christian is a murderer, and you know that no murderer has eternal life residing in him. We have come to know love by this: that Jesus laid down his life for us; thus we ought to lay down our lives for our fellow Christians. read more.
But whoever has the world's possessions and sees his fellow Christian in need and shuts off his compassion against him, how can the love of God reside in such a person? Little children, let us not love with word or with tongue 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

(See what sort of love the Father has given to us: that we should be called God's children -- and indeed we are! For this reason the world does not know us: because it did not know him. Dear friends, we are God's children now, and what we will be has not yet been revealed. We know that whenever it is revealed we will be like him, because we will see him just as he is. And everyone who has this hope focused on him purifies himself, just as Jesus is pure). read more.
Everyone who practices sin also practices lawlessness; indeed, sin is lawlessness. And you know that Jesus was revealed to take away sins, and in him there is no sin. Everyone who resides in him does not sin; everyone who sins has neither seen him nor known him.

Love » Those that do not love others

1 John 3:10

By this the children of God and the children of the devil are revealed: Everyone who does not practice righteousness -- the one who does not love his fellow Christian -- is not of God. Verse Concepts

1 John 4:8

Love » God being love

1 John 4:7-8

Dear friends, let us love one another, because love is from God, and everyone who loves has been fathered by God and knows God. The person who does not love does not know God, because God is love.

Love » The source of love

1 John 4:7-21

Dear friends, let us love one another, because love is from God, and everyone who loves has been fathered by God and knows God. The person who does not love does not know God, because God is love. By this the love of God is revealed in us: that God has sent his one and only Son into the world so that we may live through him. read more.
In this is love: not that we have loved God, but that he loved us and sent his Son to be the atoning sacrifice for our sins. Dear friends, if God so loved us, then we also ought to love one another. No one has seen God at any time. If we love one another, God resides in us, and his love is perfected in us. By this we know that we reside in God and he in us: in that he has given us of his Spirit. And we have seen and testify that the Father has sent the Son to be the Savior of the world. If anyone confesses that Jesus is the Son of God, God resides in him and he in God. And we have come to know and to believe the love that God has in us. God is love, and the one who resides in love resides in God, and God resides in him. By this love is perfected with us, so that we may have confidence in the day of judgment, because just as Jesus is, so also are we in this world. There is no fear in love, but perfect love drives out fear, because fear has to do with punishment. The one who fears punishment has not been perfected in love. We love because he loved us first. If anyone says "I love God" and yet hates his fellow Christian, he is a liar, because the one who does not love his fellow Christian whom he has seen cannot love God whom he has not seen. And the commandment we have from him is this: that the one who loves God should love his fellow Christian too.

God, Love Of » Is a part of his character

2 Corinthians 13:11

Finally, brothers and sisters, rejoice, set things right, be encouraged, agree with one another, live in peace, and the God of love and peace will be with you. Verse Concepts