Today's reading is the Christmas story from a cosmic perspective. We see portents (signs) of Mary giving birth to Jesus and we see how much of a threat to Satan that is. Satan tries to kill Jesus at birth and tries to take over heaven. But Michael, the archangel defeats Satan in heaven, and God protects Mary and Jesus on earth. That leaves Satan with no target but the church on earth. The lesson to take away from this story is that the power of evil is going to persecute the church, but in the end, God's victory is sure. Notice again that the church conquers Satan by testifying to Christ, even when it means risking our life.