Passage
And I saw a new heaven and a new earth, for the first heaven and the first earth did pass away, and the sea is not any more;
And I saw a new heaven and a new earth, for the first heaven and the first earth did pass away, and the sea is not any more;
Revelation 21:1 And I saw a new heaven and a new earth, for the first heaven and the first earth did pass away, and the sea is not any more;
Revelation 21:2 and I, John, saw the holy city--new Jerusalem--coming down from God out of the heaven, made ready as a bride adorned for her husband;
Revelation 21:3 and I heard a great voice out of the heaven, saying, `Lo, the tabernacle of God <FI>is<Fi> with men, and He will tabernacle with them, and they shall be His peoples, and God Himself shall be with them--their God,
The verse centers on "heaven", "earth", "first", "pass", 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 John 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.