New Defender's Study Bible Notes
14:12 fallen from heaven. Although the prophecy is directed toward the earthly king of Babylon (Isaiah 14:4), here it goes far beyond him (he could never fall from heaven!) to the wicked spirit possessing his body and inspiring his actions. Just as Satan possessed and used the serpent’s body in Eden, so he does here with Babylon’s king.
14:12 O Lucifer. “Lucifer” means “shining one” and is rendered “day-star” in some translations. This is the only time it occurs in the Bible, but clearly seems intended as a name of Satan, and has been so used throughout history. Many New Age and other pantheistic cults have adopted Lucifer as their “god.”