At one time Lucifer, a top-ranking angel, led a rebellion against God. He and his followers were cast out of Heaven. Lucifer became Satan and his followers became demons. Because of this, there are now two forces in the world—good and evil, right and wrong....
How you are fallen from heaven, O Lucifer, son of the morning! How you are cut down to the ground, you who weakened the nations! For you have said in your heart: "I will ascend into heaven, I will exalt my throne above the stars of God; I will also sit on the mount of the congregation on the farthest sides of the north; I will ascend above the heights of the clouds, I will be like the Most High."
(Isaiah 14:12-14 NKJV)