I don't typically post extended passages of scripture, especially if I don't offer some commentary. However, as I was reading Peter Leithart's book The Four: A Survey of the Gospels, I came across a passage from Isaiah which he quoted in full. I was moved.
Leithart explains that "After the exile, holiness is no longer locked up in the temple. It spreads to the whole city of Jerusalem and to the whole land." During her exile, Israel had "more contact than ever" with the Gentile nations. Despite the mess the Jews made of the New Covenant and their idolizing of the blessings of God (like the temple, circumcision, the law), God would come and bring light to all nations.
Leithart quotes numerous passages from Daniel, Ezekiel, Zecheriah, and Jeremiah, but the following passage from Isaiah is awe-inspiring and full of great hope. In many ways the passage speaks for itself, but context is helpful. Hopefully my short summary of Leithart's fine explanation is enough to help you appreciate the glory of Isaiah 66:18-23.
18 “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, 19 and I will set a sign among them. And from them I will send survivors to the nations, to Tarshish, Pul, and Lud, who draw the bow, to Tubal and Javan, to the coastlands far away, that have not heard my fame or seen my glory. And they shall declare my glory among the nations. 20 And they shall bring all your brothers from all the nations as an offering to the Lord, on horses and in chariots and in litters and on mules and on dromedaries, to my holy mountain Jerusalem, says the Lord, just as the Israelites bring their grain offering in a clean vessel to the house of the Lord. 21 And some of them also I will take for priests and for Levites, says the Lord.
22 “For as the new heavens and the new earth
that I make
shall remain before me, says the Lord,
so shall your offspring and your name remain.
23 From new moon to new moon,
and from Sabbath to Sabbath,
all flesh shall come to worship before me,
declares the Lord.
Come, all ye nations, come. Come to the light of the glory of God in the face of Christ.