Jerome : When Isaiah had seen the Lord seated high upon a lofty throne, what does he say? "Woe is me, because I am in sorrow; because I am a man of unclean lips, and I dwell in the midst of a people that has unclean lips." Pay attention to his exact words: Woe is me because of my unclean lips. After that, what does he tell us? Because his lips are soiled, one of the seraphim is sent to him, and the seraph taking a burning coal from the altar touches with it Isaiah's lips and tongue and purifies his mouth. Then what does the seraph say? "See," he said, "now that this has touched your lips, your tongue is cleansed." Then immediately, what does the Lord say? "Whom shall I send? Who will go for us?" O divine secrets of Scripture! As long as Isaiah's tongue was treacherous and his lips unclean, the Lord does not say to him, Whom shall I send, and who shall go? His lips are cleansed, and immediately he is appointed the Lord's spokesman; hence it is true that the person with unclean lips cannot prophesy, nor can he be sent in obedient service to God. "With fiery coals of the desert." Would to heaven this solitude were granted us, that it would clear away all wickedness from our tongue, so that where there are thorns, where there are brambles, where there are nettles, the fire of the Lord may come and burn all of it and make it a desert place, the solitude of Christ. — HOMILIES ON THE Psalms 41 (Psalms 119) Jerome : (Verse 8.) And I heard the voice of the Lord saying: Whom shall I send, and who will go for us? And I said: Here am I, send me. Because both us and all the other interpreters have translated it, the Hebrew phrase Lanu (), which means 'for us,' is put by the LXX to this people, which is not at all found in the Hebrew. But when it is said in the person of God, 'for us' is to be understood in that sense in which it is read in Genesis: Let us make man in our image, and likeness (Gen. 1:26), to indicate the sacrament of the Trinity. For just as we read in the Gospel, when the Lord says, 'I and the Father are one' (John 10:30), and we refer this to the unity of nature, namely, that we are one in essence, but to the diversity of persons, the Trinity governs as commanded by the Lord. However, the Lord does not specify whom to go forth, but presents the listeners with an option, so that the will may obtain the reward. And the Prophet does not promise to go forth by presumption and the arrogance of his own conscience, but by confidence: because his lips have been cleansed, and iniquity has been removed, and sin has been purified. Therefore Moses also, to whom the Lord said: Come, I will send thee to Pharaoh, the king of Egypt (Exod. III, 10), and he said: I beseech thee, Lord, I am not eloquent, send whom thou wilt (Exod. IV, 13), answered not with contempt, but with humility, because he had not heard anything from his purified lips, who had been educated in all the wisdom of the Egyptians. And Isaiah, not by his own merit, but by the grace of the Lord, by which he was purified, offered himself to the service. But others think that Isaiah offered himself because he thought that he had good news to announce to the people. But because he heard, 'Go, tell this people: You shall indeed hear but not understand, you shall indeed see but not perceive' (Isaiah 6:9), therefore, in the following passages, when the voice of the Lord said to him, 'Cry out,' he does not immediately cry out, but he asks, 'What shall I cry?' The prophet Jeremiah, to whom it had been said, 'Take this cup of the wine of wrath from my hand and drink to all the nations to which I send you' (Jeremiah 25:15), willingly receiving the cup of sufferings, so that he might offer it to the opposing nations, for them to drink, and vomit, and fall down; after he heard, 'Go and first offer it to Jerusalem,' he replied, 'You have deceived me, Lord, and I was deceived' (Jeremiah 20:7). This is the observance of the Hebrews. However, we say that it is not a matter of rashness, but of obedience, to offer oneself to be sent by the Lord. — Commentary on Isaiah