For if what faded away came with splendor, how much more splendid what is permanent must be!

taking with him no blood of goats and calves, but his own, and secured our permanent deliverance.

Now the words "But once more" indicate the final removal of all that is shaken, as only created, leaving only what is unshaken to be permanent.

for we have no permanent city here on earth, but we are in search of the city that is to come.