Deus caritas est
My dear friends, let us love each other, since love is from God and everyone who loves is a child of God and knows God. Whoever fails to love does not know God, because God is love. This is the revelation of God's love for us, that God sent his only Son into the world that we might have life through him. Love consists in this: it is not we who loved God, but God loved us and sent his Son to expiate our sins.
My dear friends, if God loved us so much, we too should love each other. No one has ever seen God, but as long as we love each other God remains in us and his love comes to its perfection in us. This is the proof that we remain in him and he in us, that he has given us a share in his Spirit.
We ourselves have seen and testify that the Father sent his Son as Savior of the world. Anyone who acknowledges that Jesus is the Son of God, God remains in him and he in God. We have recognised for ourselves, and put our faith in, the love God has for us.
God is love, and whoever remains in love remains in God and God in him. Love comes to its perfection in us when we can face the Day of Judgement fearlessly, because even in this world we have become as he is. In love there is no room for fear, but perfect love drives out fear, because fear implies punishment and whoever is afraid has not come to perfection in love.
Let us love, then, because he first loved us. Anyone who says 'I love God' and hates his brother, is a liar, since no one who fails to love the brother whom he can see can love God whom he has not seen. Indeed this is the commandment we have received from him, that whoever loves God, must also love his brother.
Whoever believes that Jesus is the Christ is a child of God, and whoever loves the father loves the son. In this way we know that we love God's children, when we love God and keep his commandments. This is what the love of God is: keeping his commandments. Nor are his commandments burdensome because every child of God overcomes the world. And this is the victory that has overcome the world—our faith.
The New Jerusalem Bible, The First Letter of John, 4:7 to 5:4