How do we know the promise of living forever in paradise is true. Because of what it says at Revelation 21: 5 And the One seated on the throne said: “Look! I am making all things new.” Also he says: “Write, for these words are faithful and true.” Titus 1:2 ". . . and is based on a hope of the everlasting life that God, who cannot lie, promised long ago" Go to jw.org and learn more.