Peace and goodness could triumph over the strife and discord of their life with each other. Their after desolate land might be fruitful yet again, and their worship may very well be filled with joy (Zech. 8:19). Therefore, when Paul helps make the contrast amongst the Jerusalem from down below https://richardfrench.net/what-is-the-new-jerusalem-heaven-on-earth-in-revelation-21-22/