Isaiah 16:6

(Vers. 6, 7.) We have heard of the pride of Moab, he is exceeding proud: his pride, and his arrogancy, and his indignation, is more than his strength. Therefore shall Moab howl for Moab, every one shall howl: for the foundations of Kirhareseth shall ye mourn; surely they are stricken. For the fields of Heshbon languish, and the vine of Sibmah: the lords of the heathen have broken down the principal plants thereof, they are come even unto Jazer, they wandered through the wilderness: her branches are stretched out, they are gone over the sea. Therefore I will bewail with the weeping of Jazer the vine of Sibmah: I will water thee with my tears, O Heshbon, and Elealeh: for the shouting for thy summer fruits and for thy harvest is fallen. And gladness is taken away, and joy out of the plentiful field; and in the vineyards there shall be no singing, neither shall there be shouting: the treaders shall tread out no wine in their presses; I have made their vintage shouting to cease. Wherefore my bowels shall sound like an harp for Moab, and mine inward parts for Kirharesh. But through these [events] it shows both the power of former happiness and the blows of sudden overthrow.

(Verse 6) We have heard the pride of Moab: he is very proud. His pride, and his arrogance, and his indignation, are greater than his strength. It is clear from the obscurities in this passage, as it can hardly be read, how involved it is according to the Septuagint interpreters. Let us therefore speak according to the Hebrew, which is the custom of the Scriptures, that after they have relieved the despair of the human mind with glad news, they may again warn and deter those who are negligent and unwilling to repent with the threat of punishment, lest the goodness of God harden our hearts. Let us present just one example of this matter. In the 144th Psalm we read: The Lord is sweet to all, and his mercy is upon all his works. And after a little while: The Lord sustains all who fall, and raises up all who are cast down. The eyes of all look to you, O Lord, and you give them food in due season. And when he had finished, the Lord kept all who loved him; lest he make the listener negligent, he added: And he will destroy all sinners. Therefore, after the Antichrist and his parent, the devil, who trampled upon the whole earth, have been consumed, it is prophesied that a throne is to be prepared in mercy, and he who will sit in the tabernacle of David, from the person of the saints who have been saved from Moab, and through their experience have learned his pride, the prophet speaks: You have heard the pride of Moab, or rather, the injury, as the Septuagint translated. For who among heretics is not arrogant? They despise the simplicity of the Church and treat its people like brute animals. They are so filled with pride and arrogance that they arm themselves against the Creator, attacking His prophets as if they were challenging the authority of the Gospel. In which the Savior says, 'All who came before me were thieves and robbers' (John 10:8). They even dare to call Moses, the servant of God, a murderer, and they slander Joshua, the son of Nun, as if he were a bloodthirsty man, despite his great holiness that caused the sun and moon to stand still at his command. They also call David, from whose lineage Christ was born (Matthew 1), a murderer and adulterer, without considering his repentance and gentleness which are compared to the mercy of God. But although he may be proud and arrogant, and although he may rejoice in his madness: nevertheless he dares more than his strength allows.

Here he sets out contempt of counsel proceeding from their pride. Hence he describes their pride as to three things: first, as to its being made commonly known: we have heard, as if it were public; as to its quantity: he is exceeding proud; as to its exceeding their dignity: his pride, by which he extolls himself as to the gifts he possesses, and his arrogancy, by which he pretends to have gifts that he does not possess, and his indignation, by which he presumptuously proposes vengeance, is more than his strength.