Daniel 4:17

The dream which was seen by Nebuchadnezzar was displayed as a punishment for the king himself, whose heart was exalted and lifted up against God, having set up a golden image and having forced all to be idolaters, it was shown to him through a vision that even he might see that he has the lot of being under the authority of God, even if he seems to at some time reign over all the kings of the earth. And so that it may be shown that the kingdom which was given to him was from God, Daniel said to him, "You O king, are a king of kings, to whom the God of heaven has given a strong and powerful and honorable kingdom in every place where the sons of men dwell." [Daniel 2:37-38] And the king himself, having been amazed at the dream which Daniel interpreted, spoke similarly, "In truth your God, he is God of gods and Lord of lords because he is able to reveal this mystery." [Daniel 2:47] And so when he forgot the first matters and he was later arrogantly lifted up, he received this punishment from God as an example and a model which was meant for all human tyrants and kings, so as they who think they are above man may not brag, and that they who are lifted up may not boast against God, but they may foresee their danger and may fear God, seeing that they also have a Lord in the heavens. For also Antiochus who was called Epiphanes, who became the king of Syria, who tortured the slaves of God with various torments, and having undertaken baser things at last even he came upon the deserved retribution from God and was punished with divine scourges, and he was not even able to endure his own stench, but while he was still living, worms swarmed from his impious eyes, and though proclaiming many entreaties and confessions to God, his salvation did come upon him. […]

This is what the angel means, that the fate of the tree will come to pass for this purpose, for everyone to know through this that there is one God, Lord and King, who appoints kings on the earth and entrusts the kingdom to whomever …

Verse 17. "In the decision of the watchmen, i.e., the angels, lies the decree and the speech and the petition of the holy ones." Moreover it is both Greek and Latin usage to call the rainbow iris, because it is said to descend to earth in a multicolored arch.

It is by the decree of the watchers; not that the great God needs the counsel or concurrence of the angels in any thing he determines or does, but, as he uses their ministration in executing his counsels, so he is sometimes represented, after the manner of men, as if he consulted them. So it denotes the solemnity of this sentence.

Of the holy ones - The decree was God's, and the demand was of the holy angels; if God enact it, the angels had the dispensation of it put into their hands, and they all consent to it as a just judgment of God to be executed by them according to the will of God. The most high ruleth - Nebuchadnezzar and his flatterers conceded he was a God in earth unaccountable to any.