PERMANENCY OF HEAVEN.
The only permanent or imperishable feature of our universe is the Heaven part of it. The created or visible worlds are mere dark appendages of the real spheres, and are serving their parts in bringing fruit to their Maker.
Sin-cursed and sinless worlds are coming to an end continually, and as rapidly are new ones flung out or old ones re-peopled to serve as garden plots to bear fruit in the form of created intelligences who serve and admire God through choice.
Heaven is indestructible. It has already been in existence since the morning of time. In all my journey, no angel or mortal could tell me how many cycles ago that was. But it must be said that Heaven does not always present the same aspect. Mansions are built for the reception of new arrivals, or for the vast delegations from millennial worlds.