Horatius Bonar emphasizes the transformative promise of Revelation 21:4, where the former things of pain, sin, and decay will pass away with the coming of the perfect. He explains that our current earthly existence, marked by suffering and mortality, is temporary, and that through spiritual rebirth, we will experience a new creation free from evil and sorrow. Bonar reassures that not only will our bodies and souls be renewed, but the earth itself will be restored to a state of righteousness and beauty, free from the curse of sin. He concludes with a call to readiness for the imminent return of Christ, urging believers to prepare for the glorious future that awaits them.