I just read this in a piece by N.T. Wright entitled, "The Most Dangerous Baby." The article is discussing the two kingdoms "destined to compete, kingdoms that offer radically different definitions of what peace and power and glory are all about" - the earthly kingdom of Augustus that was already well-established when Jesus was born, and the new kingdom Jesus was about to usher in.

Augustus' empire is like a well-lit room at night: the lamps are arranged beautifully, they shed pretty patterns, but they have not conquered the darkness outside. Jesus' kingdom is like the morning star rising, signaling that it is time to blow out the candles, to throw open the curtains, and to welcome the new day that is dawning. Glory to God in the highest and peace among those with whom he is pleased!