Can you imagine being an angel knowing who that is and watching Christ go through all he experienced? Every moment of that would have been completely “mindblowing”. From His incarnation as a baby until the time of His death, for the angels each step He took would have have been so mysterious and such a revelation.
We who believe and have become the sons of God are wonder to them as well! We have received Him even though we have not seen Him. We don’t know His glory in the way the angels do. We haven’t seen Him on the throne in the heavens as they have. We didn’t even see Him on earth! Yet because of faith, we love Him and rejoice with joy unspeakable and full of glory:
"Whom having not seen, ye love; in whom, though now ye see him not, yet believing, ye rejoice with joy unspeakable and full of glory." 1 Peter 1:8
For that reason, the angels long to inquire into this salvation.
"Unto whom it was revealed, that not unto themselves, but unto us they did minister the things, which are now reported unto you by them that have preached the gospel unto you with the Holy Ghost sent down from heaven; which things the angels desire to look into." 1 Peter 1:12
Read the book Here -> Romans 1-8 – Christ our Righteousness in Heaven – Our Life on Earth