Passage
And I saw a new heaven and a new earth: for the first heaven and the first earth are passed away; and the sea is no more.
And I saw a new heaven and a new earth: for the first heaven and the first earth are passed away; and the sea is no more.
Revelation 21:1 And I saw a new heaven and a new earth: for the first heaven and the first earth are passed away; and the sea is no more.
Revelation 21:2 And I saw the holy city, new Jerusalem, coming down out of heaven of God, made ready as a bride adorned for her husband.
Revelation 21:3 And I heard a great voice out of the throne saying, Behold, the tabernacle of God is with men, and he shall dwell with them, and they shall be his peoples, and God himself shall be with them, [and be] their God:
The verse centers on "heaven", "earth", "first", "passed", and "away". It is saying that the verse draws attention to "heaven" and "earth", so its meaning should be read from those terms before moving to application.
The next verse adds "And I saw the holy city new...", so "heaven" and "earth" should be read forward into that movement. In Revelation context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "heaven" and "earth" with trust shaped by these words, not by a vague optimism outside the passage.