And you will say in that day:

“Give thanks to the Lord,
    call upon his name,
make known his deeds among the peoples,
    proclaim that his name is exalted.

“Sing praises to the Lord, for he has done gloriously;
    let this be made known in all the earth.
Shout, and sing for joy, O inhabitant of Zion,
    for great in your midst is the Holy One of Israel.” – Isaiah 12:4-6 ESV

Notice that God is the main focus of these verses. He will receive thanks. It will be His deeds that are made known. His name will be exalted. Praises will be sung to Him and about Him. Because He alone is great. God’s restoration of His people will not go unnoticed by the rest of the world. They will recognize His glory and greatness as He displays His covenant faithfulness. But they will also see and experience His glory in the form of His judgment. As Isaiah has made clear, the day is coming when God will reveal His glory as He metes out justice to the nations.

“My mercy and justice are coming soon.
    My salvation is on the way.
    My strong arm will bring justice to the nations.
All distant lands will look to me
    and wait in hope for my powerful arm.
Look up to the skies above,
    and gaze down on the earth below.
For the skies will disappear like smoke,
    and the earth will wear out like a piece of clothing.
The people of the earth will die like flies,
    but my salvation lasts forever.
    My righteous rule will never end!” – Isaiah 51:5-6 NLT

Again, don’t miss the emphasis of these verses: My mercy and justice. My salvation. My strong arm. My righteous rule. It will all be about God and His glory. In fact, verse 18 of this chapter clearly states that the focus of all that happens in the end times will be about the glory of God.

“For I know their works and their thoughts, and the time is coming to gather all nations and tongues. And they shall come and shall see my glory…”

The Hebrew word translated “glory” is kabowd and it literally means “heaviness.” But it is primarily used to refer to the weight or significance of something or someone. Used of God, it is an expression of His greatness, magnificence, and majesty. God’s glory is what sets Him apart as the one true God. Isaiah 43:7 tells us that we were made for God’s glory. In other words, our very existence points back to His majesty as the Creator-God. The psalmist tells us that “The heavens declare the glory of God, and the sky above proclaims his handiwork” (Psalm 19:1 ESV). The apostle Paul reminds us that, as believers, we are vessels of clay in which the very glory of God is contained (2 Corinthians 4:7).

God is all about His glory, and He can reveal His glory in a variety of ways. In fact, all that He does reveals His glory. When He saves, He receives glory. When He judges, He is glorified. When He displays His righteous indignation against sinful mankind, the glory of His character is revealed. God’s merciful and gracious gift of His Son as payment for the sins of man is a manifestation of His glory. And Jesus told His followers that, when they bear fruit, “This brings great glory to my Father” (John 15:8 NLT).

So, back to the closing verses of Isaiah 66. What does any of this have to do with God’s glory? God talks about coming in fire and rendering His anger in fury. He describes His judgment as resulting in the deaths of many. In fact, the very last verse in the entire book states:

“And they shall go out and look on the dead bodies of the men who have rebelled against me. For their worm shall not die, their fire shall not be quenched, and they shall be an abhorrence to all flesh.” – Isaiah 66:24 ESV

And while that description may leave us feeling a bit discomfited, we must not overlook the reality that it too reveals the glory of God. He is going to deal with rebellious mankind once and for all. And less we think that God is being a bit too harsh, we have to remember that He has been extending grace and mercy to the nations for centuries. He has been showing great patience for generations. But the day is coming when His patience will run out and His righteous judgment will be poured out. And, as the book of Revelation reveals, when the period of the Tribulation comes and God begins to pour His final judgments upon humanity, the vast majority of them will refuse to repent.

Everyone was burned by this blast of heat, and they cursed the name of God, who had control over all these plagues. They did not repent of their sins and turn to God and give him glory. – Revelation 16:9 NLT

…and they cursed the God of heaven for their pains and sores. But they did not repent of their evil deeds and turn to God. – Revelation 16:11 NLT

And yet, notice what God is going to do. Isaiah reveals that there is a day coming when God will display His glory in yet another way. He will send messengers to all those whom He spares from judgment, giving them a second and final chance to see and experience His glory in the form of salvation.

“I will perform a sign among them. And I will send those who survive to be messengers to the nations—to Tarshish, to the Libyans and Lydians (who are famous as archers), to Tubal and Greece, and to all the lands beyond the sea that have not heard of my fame or seen my glory. There they will declare my glory to the nations.” – Isaiah 66:19 NLT

God will be glorified as He redeems and restores a remnant of His rebellious people, Israel. But He will also be glorified when He spares and saves a portion of sinful mankind. And the outcome of all God’s activities in those days will be the worship of Him.

“All humanity will come to worship me
    from week to week
    and from month to month.” – Isaiah 66:23 NLT

And the apostle John provides us with a marvelous description of that day, when God and His Son will rule over all the earth and their glory will fill the earth.

No longer will there be a curse upon anything. For the throne of God and of the Lamb will be there, and his servants will worship him. And they will see his face, and his name will be written on their foreheads. And there will be no night there—no need for lamps or sun—for the Lord God will shine on them. And they will reign forever and ever. – Revelation 22:3-5 NLT

We shall declare His glory.