John returns to his favourite theme - the Love of God. He talks of the Divinity of that love. God's love is so different from any kind of human love that we know. Then the Display of God's love is seen at the place which is called Calvary. He concludes in these 7 verses that if God loved us then we ought to love one another. This is our Duty towarsds that love. It is helped by God giving us of his Spirit.