An Angel's Descent

Angelus autem Domini descendit cum Azaria et sociis ejus in fornacem, et excussit flammam ignis de fornace... Oppressa perturbationibus anima, et variis molestiis occupata, cum hominum desperaverit auxilium, et tota ad Dominum fuerit mente conversa, descendit ad eam angelus Domini, scilicet, sermo divinus, et excutit flammae aestuantis ardores: ut nequaquam ignita jacula inimici cordis nostri arcana penetrent, nec illius fornace claudamur. Sanctus Hieronymus, Commentariorum in Daniel, Caput III Source: Migne PL 25.510b-c

And an angel of the Lord came down among Azarias and his companions in the furnace... 1 When the soul is oppressed by troubles and occupied by many worries, when it despairs of the help of men, and with all its mind it turns to the Lord, the angel of the Lord descends, that is, the divine word, and it extinguishes the fire of scorching flames, so that the blazing shaft of the enemy does not penetrate into the secret chambers of our heart, nor are we shut up in his furnace. Saint Jerome, Commentary on Daniel, Chapter 3 1 Dan 3.49