They shall declare my glory among the nations
The end goal in redemption is that everyone in the new heavens and new earth will praise God. God will judge all those who have sinned against Him and rejected the Savior whom He sent, and all who remain will worship Him forever.
The glorious beauty of this "all who remain" is that it will be people from all over the world. The last chapter of Isaiah looks forward to this. Isaiah 66:18 says,
...the time is coming to gather all nations and tongues. And they shall come and shall see my glory...
And then in verses 19-20, we see that God would send people to the nations, naming several places and then saying,
...to the coastlands far away, that have not heard my fame or seen my glory. And they shall declare my glory among the nations. And they shall bring all your brothers from all the nations as an offering to the LORD...
And then in verse 23, we read,
From new moon to new moon, and from Sabbath to Sabbath, all flesh shall come to worship before me...
Right now, not all flesh (humanity) worships God. True Christians are a minority in the world. But since Christ came in His first advent, the gospel has been spreading to the ends of the earth. People from nations and tongues all over the world have seen God's glory in Christ and are praising Him for it. That will continue to happen until Christ returns, and at that point, all those who don't believe will be judged, and all who remain will worship before Him all the time.
Thus, in eternity, everyone in the kingdom of heaven will worship God continually. That's the glorious end to which we're headed.
Today's reading: Isaiah 62-66