Ezekiel saw vision of the glory of the Lord departing from the Temple. Destruction soon followed. Now God is returning to be with His people. This is not done by human strength, All the world kingdoms, leaders, great ones all quickly perish. The Word of God endures forever.
Nations come and go, philosophy of the world is constantly changing.
One thing never changes, Word of God. We can depend on His promises. He has returned to Zion, Promises are fulfilled. Still future when Isaiah writes, but they are so certain that Isaiah can write as if they are fulfilled. We must continually behold our God and remember to remain strong.