They could not read the writing - Because it was in the pure Hebrew, not the Chaldean character. See below.
28. Associates Understood Faith—These faithful Hebrews possessed great natural ability and intellectual culture, and they occupied a high position of honor; but all these advantages did not lead them to forget God. All their powers were yielded to the sanctifying influence of divine grace. By their godly example, their steadfast integrity, they showed forth the praises of Him who had called them out of darkness into His marvelous light. In their wonderful deliverance was displayed, before that vast assembly, the power and majesty of God. Jesus placed Himself by their side in the fiery furnace, and by the glory of His presence convinced the proud king of Babylon that it could be no other than the Son of God. The light of heaven had been shining forth from Daniel and his companions, until all their associates understood the faith which ennobled their lives and beautified their characters (The Review and Herald, February 1, 1881). 4BC 1170.1
17. Men of Destiny Watched With Vigilance—The Lord God omnipotent reigneth. All kings, all nations, are His, under His rule and government. His resources are infinite. The wise man declares, “The king's heart is in the hand of the Lord, as the rivers of water: he turneth it whithersoever he will.” 4BC 1170.2
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