Answer: It reminds us that this present fallen world is not all there is; soon we will live with and enjoy God forever in the new city, in the new heaven and the new earth, where we will be fully and forever freed from all sin and will inhabit renewed, resurrection bodies in a renewed, restored creation.

Scripture: Revelation 21:1-4 – Then I saw a new heaven and a new earth, for the first heaven and the first earth had passed away, and the sea was no more. And I saw the holy city, new Jerusalem, coming down out of heaven from God, prepared as a bride adorned for her husband. And I heard a loud voice from the throne saying, “Behold, the dwelling place of God is with man. He will dwell with them, and they will be his people, and God himself will be with them as their God. He will wipe away every tear from their eyes, and death shall be no more, neither shall there be mourning, nor crying, nor pain anymore, for the former things have passed away.”

Source: New City Catechism