Satan and Lucifer are two completely different beings. Satan is the Adversary. His entire persona is shaped by his function of opposing God's will. Lucifer, by contrast, is a version of Prometheus. He is distinguished by his pride, and by his sense of justice and righteousness. He opposes God only because he believes God to be making a mistake. He is punished for his opposition, just as Prometheus was punished for opposing Zeus. Satan is never punished for his opposition to God, because that is his natural function in the world. Satan exists only to oppose God. When Satan opposes God, he is doing what he is supposed to be doing; when Lucifer opposes God, he is defying God's will. One way to think of these two beings is to imagine that Lucifer is the angel who rebelled against God in heaven, and was cast down for it; and Satan is the angel who Lucifer became once he was thrown down onto the earth. Lucifer was beautiful; Satan is ugly. Lucifer represents righteous defiance of tyranny; Satan represents willful destruction and obstruction for its own sake.