What the Bible says about Eternality of God
(From Forerunner Commentary)
In Psalm 102, these words apply simply to the eternality of God, but here they are applied directly to Christ without qualification. By God's Spirit in us, He has also made us understand that Jesus was the God of the Old Testament. As far as we know, not many Jews grasped this reality, but the passage presupposes this fact. The writer of Hebrews uses it as another opportunity to exalt Jesus Christ above angels. Unlike them, He lives eternally.
The author's remark about clothing helps as it addresses the subject of created things in contrast to the eternal God who created all physical things. The quotation's mention of clothing that will be rolled up and disposed of illustrates an eternal truth. All of the physical creation is slowly but constantly wearing down. It is absolutely, relentlessly perishing. From this, we extract a fundamental truth of life: Jesus Christ, the Creator God, began the universe, and He will end it. A new heaven and a new earth will be established (Revelation 21:1), but through it all, He remains the same (Hebrews 13:8).
John W. Ritenbaugh
Why Hebrews Was Written (Part Eight): Hebrews 1