Observe the piety of the children: they showed no indignation, no anger, no gainsaying, but they came forth … as though they were going forth from heaven itself.… And what the prophet says of the sun, that “he is as a bridegroom going out of his chamber,” so one could also say such a thing of them. But though he [the sun] goes forth [like the bridegroom], yet did they come out with even more glory than he, for he indeed goes forth to enlighten the world with natural light, they to enlighten the world in a different way, I mean, spiritually. For because of them the king immediately issued a decree, “The signs and wonders that the most high God has worked for me I am pleased to recount.” … So they went forth, shedding a yet more glorious radiance, beaming indeed in that very region, even more so by way of the king’s writings, being diffused over the world and thus dispelling the darkness that everywhere prevails.
Verses 1-3. "Nebuchadnezzar the king unto all the peoples, nations and languages who dwell upon the whole earth: peace be multiplied unto you. The Most High God hath performed signs and wonders towards me. Therefore I have thought it well to declare His signs, for they are great, and His marvels, for they are mighty, and His kingdom, because it is (the Vulgate omits "because it is") an eternal kingdom, and His dominion is from generation to generation." The epistle of Nebuchadnezzar was inserted in the volume of the prophet, in order that the book might not afterwards be thought to have been manufactured by some other author, as the accuser (Porphyry) falsely asserts, but the product of Daniel himself.
[AD 407] John Chrysostom on Daniel 4:1