13 Contemplate with me also, how first he proclaims the Arbiter of the contest. “Blessed be God, who has sent His angel and delivered His servants.” This of the power of God. He speaks also of the virtue of the combatants. “Because they trusted in Him, and have changed the king's word, and have yielded their bodies, that they might not worship any god except their own God.” Could anything equal the virtue of this? Before this, when they said, “We will not serve your gods,” he was inflamed more fiercely than the very furnace; but now, when by their deeds they had taught him this, he was so far from being indignant, that he praised and admired them, for not having obeyed him!
So good a thing is virtue, that it has even its enemies themselves to applaud and admire it! These had fought and conquered, but the vanquished party gave thanks, that the sight of the fire had not terrified them, but that the hope in their Lord had comforted them. And He names the God of the whole world after the three youths, not at all circumscribing His sovereignty, but inasmuch as these three youths were equivalent to the whole world. For this reason he both applauds those who had despised him, and passing by so many governors, kings, and princes, those who had obeyed him, he stands in admiration of the three captives and slaves, who derided his tyranny!
For they did these things, not for the sake of contention, but for the love of wisdom; not of defiance, but of devotion; not as being puffed up with pride, but fired with zeal. For great indeed is the blessing of a hope in God; which then also the barbarian learned, and making it manifest that it was from that source they had escaped the impending peril, he exclaimed aloud: “Because they trusted in Him!”
Source: Homilies on the Statues (New Advent)