1. What the prophet reflected upon in himself which terrified him: "I am undone if God deal with me in strict justice, for I have made myself obnoxious to his displeasure, because I am a man of unclean lips." Some think he refers particularly to some rash word he had spoken, or to his sinful silence in not reproving sin with the boldness and freedom that were necessary—a sin which God's ministers have too much cause to charge themselves with, and to blush at the remembrance of. But it may be taken more generally; I am a sinner; particularly, I have offended in word; and who is there that hath not? Jam. iii. 2. We all have reason to bewail it before the Lord, (1.) That we are of unclean lips ourselves; our lips are not consecrated to God; he had not had the first-fruits of our lips (Heb. xiii. 15), and therefore they are counted common and unclean, uncircumcised lips, Exod. vi. 30. Nay, they have been polluted with sin. We have spoken the language of an unclean heart, that evil communication which corrupts good manners, and whereby many have been defiled. We are unworthy and unmeet to take God's name into our lips. With what a pure lip did the angels praise God! "But," says the prophet, "I cannot praise him so, for I am a man of unclean lips." The best men in the world have reason to be ashamed of themselves, and the best of their services, when they come into comparison with the holy angels. The angels had celebrated the purity and holiness of God; and therefore the prophet, when he reflects upon sin, calls it uncleanness; for the sinfulness of sin is its contrariety to the holy nature of God, and upon that account especially it should appear both hateful and frightful to us. The impurity of our lips ought to be the grief of our souls, for by our words we shall be justified or condemned. (2.) That we dwell among those who are so too. We have reason to lament not only that we ourselves are polluted, but that the nature and race of mankind are so; the disease is hereditary and epidemic, which is so far from lessening our guilt that it should rather increase our grief, especially considering that we have not done what we might have done for the cleansing of the pollution of other people's lips; nay, we have rather learned their way and spoken their language, as Joseph in Egypt learned the courtier's oath, Gen. xlii. 16. "I dwell in the midst of a people who by their impudent sinnings are pulling down desolating judgments upon the land, which I, who am a sinner too, may justly expect to be involved in."