Eternal Importance

[23] And it shall come to pass, that from one new moon to another, and from one Sabbath to another, shall all flesh come to worship before me, saith the LORD.
[24] And they shall go forth, and look upon the carcases of the men that have transgressed against me: for their worm shall not die, neither shall their fire be quenched; and they shall be an abhorring unto all flesh.
Significantly, Isaiah began the book with a condemnation of the shallow worship of G-d's people at the time of the New Moons and Sabbaths (Isaiah 1:12-15). Now, after the greatness of the G-d's work, all that is different.
And they shall go forth and look upon the corpses of the men who have transgressed against Me: Some from every tribe and tongue will have a destiny of ultimate triumph; some also will have the destiny - freely chosen - of ultimate tragedy. Using the images of eternal damnation (their worm does not die, and their fire is not quenched), Isaiah describes the fate of those who reject G-d - even if they had the veneer of empty religion.
Go forth, and look, as the Israelites looked at the carcasses of the Egyptians destroyed at the Red Sea (Ex 14:30; compare 26:14-19; Ps 58:10; 49:14; Mal 4:1-3).
Carcasses (verse 16), are those slain by the L-rd in the last great battle near Jerusalem (Zec 12:2-9; 14:2-4); type of the final destruction of all sinners.
Worm the does not die (Mk. 9:44, 46, 48), is the image of hell, from bodies left unburied in the valley of Hinnom (whence comes Gehenna, or "hell"), south of Jerusalem, where a perpetual fire was kept to consume the refuse thrown there (30:33). It shall not be inconsistent with true love for the godly to look with satisfaction on G-d's vengeance on the wicked (Rev 14:10).
What their misery is. It is here represented by the frightful spectacle of a field of battle, covered with the carcases of the slain, that lie rotting above ground, full of worms crawling about them and feeding on them; and, if you go to burn them, they are so scattered, and it is such a noisome piece of work to get them together, that it would be endless, and the fire would never be quenched; so that they are an abhorring to all flesh, nobody cares to come near them. Now this is sometimes accomplished in temporal judgments.
After this life, and at the Day of Judgment, they shall go into eternal torments; where they will feel a work of conscience that shall never die and a fiery wrath of G-d upon their souls and bodies that shall never go out.
Our Savior applies it to the everlasting misery and torment of impenitent sinners in the future state, where their worm dies not, and their fire is not quenched (Mark 9:44); for the soul, whose conscience is its constant tormentor, is immortal, and
G-d, whose wrath is its constant terror, is eternal. What notice shall be taken of it? Those that worship G-d shall go forth and look upon them, to affect their own hearts with the love of their Redeemer, when they see what misery they are redeemed from. As it will aggravate the miseries of the damned to see others in the kingdom of heaven and themselves thrust out (Luke 13:28), so it will illustrate the joys and glories of the blessed to see what becomes of those that died in their transgression, and it will elevate their praises to think that they were themselves as brands plucked out of that burning. To the honor of that free grace which thus distinguished them let the redeemed of the L-rd with all humility, and not without a holy trembling, sing their triumphant songs
The book of Isaiah closes with a sobering contrast, revealing the ultimate, eternal importance of this present life. Each life can choose its destiny: worship or the worm. Which is it for you?