People sometimes ask why the devil chooses to fight against God. Passages like Isaiah 14:13-14 and Ezekiel 28:12-19 seem to show that the original reasons were proud thoughts and jealous attitudes. However, the devil is fighting a war that he will certainly lose. That fact will become clear, even to the devil, as the events in the Book of Revelation happen. So we may ask why he will continue to fight at that time.
Therefore, rejoice, O heavens and you who dwell in them! But woe to you, O earth and sea, for the devil has come down to you in great wrath, because he knows that his time is short!”
~ Revelation 12:12
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