Matthew Henry's Concise Commentary on the Bible - Revelation 21:1-8
1-8 The new heaven and the new earth will not be separate from each other; the earth of the saints, their glorified, bodies, will be heavenly. The old world, with all its troubles and tumults, will have passed away. There will be no sea; this aptly represents freedom from conflicting passions, temptations, troubles, changes, and alarms; from whatever can divide or interrupt the communion of saints. This new Jerusalem is the church of God in its new and perfect state, the church triumphant. Its... read more
George Haydock's Catholic Bible Commentary - Revelation 21:1
New, by their form and qualities, but not by their substance. --- The first heaven and first earth was passed away: being changed, not as to their substance, but in their qualities. (Challoner) read more