Two cities, two peoples. Here

So the people of God are physically within Babylon, and are also inhabitants of Babylon. There is friction between the two. The horizon of Babylon is this life, that of the members of the city of God, God’s eternity, and the coming of the seventh age. Babylon is governed by cupiditas, selfishness, the city of God by caritas, love of God and neighbour, the life of which will culminate in the age of glory, Jerusalem the golden.