Jerome : (Verse 24) Therefore, as the tongue of fire devours straw, and the heat of flames consumes it, so their root will be like embers, and their blossom will rise like dust. For they have rejected the law of the Lord of hosts and have blasphemed the word of the Holy One of Israel. Because of the higher causes of pride, drunkenness, and greed, they have brought forth thorns, hay, wood, straw, and will burn the brambles. Therefore, the root of their wickedness will be reduced to ashes, and all the beauty and splendor of wealth and the body will be compared to dust (I Cor. III). For they not only did these things, but by these steps they arrived at blasphemy, so that they would not receive the law of the Lord, and they blasphemed the word of the Holy One of Israel; concerning which we read above: From Zion the law will go forth, and the word of the Lord from Jerusalem (Isaiah 2:3). The root can be understood as evil thoughts, but the fruit and the shoot as evil deeds and words, so that what lies hidden in the root may be revealed in the shoot: both of which will be consumed by the fire of the Lord. And so the Apostle (Heb. XII, 15), refers to the root of bitterness springing up, speaking of evil. — Commentary on Isaiah