I am amazed by the number of people who do not seem to know that the Bible speaks of two forms of death. We believe the Bible when it says physical death is the reality facing every person born into the world. But there is also a very evident condition among us described as spiritual death. We trace it back to the Garden of Eden and the warning of God to our first parents: “You are free to eat from any tree in the garden; but you must not eat from the tree of the knowledge of good and evil, for when you eat of it you will surely die” (Genesis 2:16–17). Adam and Eve did not heed the warning; they ate of the forbidden fruit. And on the day that they transgressed the law of God in disobedience and self-will, they died spiritually.
Death is not annihilation. Death is not cessation of existence. Death is a changed relationship in a different form of existence.
When Satan, a creation of God, rebelled in pride and disobedience, he was saying, “I will arise and put my throne above the throne of God!” And right there Satan died. But he did not cease to be. God expelled him from heaven and from fellowship with Himself. He cast him down to earth. And after all these centuries, Satan is still around. He was not annihilated, and his eternal judgment is still to come.