1 John 3:1
See how great a love the Father has bestowed on us, that we would be called children of God; and such we are. For this reason the world does not know us, because it did not know Him.
God loved us so much that even though sin had made us the lowest of the low, He did not cast us off. Instead He made us His children. Being His children means that we moved from the lowest place, to joint heirs with Christ.
Oh what love that indeed is?