We learn that the battle btw good and evil is ancient, and that Satan has always tried to destroy God's good creation. He tried and failed to destroy Jesus; now he tries to destroy the church and the world. He raises up an unholy trinity to deceive the world and the Church; let's not be deceived into calling evil good or good evil. Let's know the difference btw the way of Jesus and the way of the Beast.
Themes:
Jesus' victory; Jesus as Lamb, the way of peace / mercy; Jesus gives His power away, vs. Satan who gathers it; the promise of Living Hope, etc.