Daniel chapter 5 contains the downward spiritual journey of the last king (Belshazzar) of the ancient Babylonian Empire - it is also a microcosmic, prophetic picture of the downward spiritual journey of the whole anti-God, Israeli-oppressive world system.  As the proud young king rejected the testimony of his grandfather (Nebuchadnezzar) about the truth of Daniel's Most High God and had not sought wisdom from God's true "wise man," Daniel during all the years of his rule - preferring to trust in his false "gods" and the flattering false counsel of his foolish young peers, so has gone world history.  As Belshazzar, his lords and their women fulfilled the lust of their flesh and deceived themselves into thinking that "peace and safety" prevailed within their Babylonian fortress, the fact was that their enemies were in the very process of infiltrating the city!  

Since Babylon's fall the night of Belshazzar's foolish feast, the world's nations and people groups have likewise foolishly neglected to keep out the great thief, Satan.  They have fallen prey to his many "alluring tricks" that numb their minds from the truth of the perilous condition without God.  Every ruler, nation, and individual without Him in, like Belshazzar, "one hour" from sudden destruction.