Revelation 21:22 And I saw no temple in the city, for its temple is the Lord God the Almighty and the Lamb. And the city has no need of sun or moon to shine on it, for the glory of God gives it light, and its lamp is the Lamb. By its light will the nations walk, and the kings of the earth will bring their glory into it, and its gates will never be shut by day—and there will be no night there. They will bring into it the glory and the honor of the nations. But nothing unclean will ever enter it, nor anyone who does what is detestable or false, but only those who are written in the Lamb’s book of life.
If there is a sad conclusion to John’s description of the city, it is to note that it will be denied to some. Chapter 21 lists the kinds of people who will not enter the city, and verse 27 summarizes by saying “only those who are written in the Lamb’s book of life” will enter the city of God. It will be too late to try to enter for the first invitation to enter into the family of God was rejected. The first invitation for redemption, salvation, forgiveness, and eternity with God was rejected in place for self-satisfying and passions for what the world has to offer. The fact that God was able to soften our heart to hear this invitation should humble our hearts and awaken our soul to deny self and serve Him with our eyes focused on Jesus Christ all the days we have this side of eternity.