6 Let us then leave to Him the time for the removal of our evils; let us only pray; let us live in piety: for this is our work, to turn to virtue; but to set us free from these evils is God's work! For indeed He is more desirous to quench this fire than thou who art tried by it: but He is waiting for your salvation. As tribulation then came of rest, so also after tribulation, rest must be expected. For neither is it always winter, nor always summer; neither are there always waves, nor always a calm; neither always night, nor always day.
Thus tribulation is not perpetual, but there will be also repose; only in our tribulation, let us give thanks to God always. For the three youths were cast into the furnace, and did not even for this forget their piety; neither did the flames affright them, but more earnestly than men sitting in a chamber, and suffering nothing to alarm them, did they, while encircled by the fire, send up to heaven those sacred prayers — therefore the fire became a wall unto them, and the flame a robe; and the furnace was a fountain; and whereas it received them bound, it restored them free.
It received bodies that were mortal, but abstained from them as if they had been immortal! It knew their nature, yet it reverenced their piety! The tyrant bound their feet, and their feet bound the operation of the fire! O marvellous thing! The flame loosed those who were bound, and was itself afterwards bound by those who had been in bonds; for the piety of the youths changed the nature of things; or rather it did not change the nature, but, what was far more wonderful, it stayed the operation of them, even while their nature remained.
For it did not quench the fire, but though burning, made it powerless. And it was truly marvellous and unaccountable, that this not only happened with respect to the bodies of these saints, but also with respect to their garments, and their shoes. And as it was in the case of the Apostles, the garments of Paul expelled diseases and demons, and the shadow of Peter put death to flight; so indeed also in this case, the shoes of these youths extinguished the power of the fire.
Source: Homilies on the Statues (New Advent)