65:17 I create new heavens. See Revelation 21:1 and II Peter 3:13. The full description of the new (i.e., “renewed”) heavens and earth is given in the Bible’s last two chapters, but is first promised here. This final cosmos will continue forever, free of all sin and death.

65:18 I create Jerusalem. This is the New Jerusalem (Revelation 21:2), the holy city, specially created and prepared by Christ (John 14:3) to last eternally.

65:20 an hundred years old. The prophecy intermingles here a description of the eternal state with that which foreshadows it—namely, the great millennial kingdom of Christ (Revelation 20:6). During the coming thousand-year reign of Christ on this present earth, antediluvian conditions will be largely restored, and some people will live perhaps the full thousand years. However, as this verse reveals, there will still be sin and death present, so it cannot be the new earth. On the new earth, there will be no sin and death (Revelation 21:4). These truths are not contradictory but complementary, the one being a type of the other. The millennial and antediluvian ages are similar, whereas the new earth represents restoration of paradise, before sin entered the world.