Here the words »Yet again, once for all« denote the removal of the things which can be shaken –created things– in order that the things which cannot be shaken may remain.
By using the words, »a new Covenant,« He has made the first one obsolete; but whatever is decaying and showing signs of old age is not far from disappearing altogether.
It said, »Write forthwith in a roll an account of what you see, and send it to the seven Churches–to Ephesus, Smyrna, Pergamum, Thyateira, Sardis, Philadelphia and Laodicea.«