This story ends, as previous ones in the book did, with the king praising and promoting Yahweh. This expression of praise, however, surpasses the others (cf. Daniel 3:28-29; Daniel 4:3; Daniel 4:34-35; Daniel 4:37). Not only did Darius personally praise God, but he ordered his subjects to do the same thing (cf. Daniel 3:29; Daniel 4:1). It is as though God was giving two witnesses to His people Israel: Nebuchadnezzar and Darius. Both monarchs testified to the living and eternal God"s unshakable sovereignty, grace, and power in heaven and on earth (cf. Daniel 4:3; Daniel 4:34-35). These testimonies certainly would have encouraged the Israelites to trust Him in spite of the circumstances of the exile. [source][source][source]
"Once again, during this time of Israel"s helplessness with her survival in doubt, Yahweh of hosts acted redemptively to strengthen his people"s faith in him. On the eve of their return to the Land of Promise under the leadership of Zerubbabel, God reassured them that he was still the same as in the days of Moses and was able to take them back to Canaan, where they could establish a new commonwealth in covenant fellowship with him." [1][source]