I will vote for this verse from today’s reading as the theme verse for the whole book. It sums up quite succinctly the writer’s point as I understand it.
Now, you see, Jesus has obtained a vastly superior ministry. In the same way, he is the mediator of a better covenant, which is established on better promises. (8:6)
I was also drawn to this verse:
They [Jewish priests, sacrifices, and law] serve as a copy and shadow of the heavenly realities. (8:5a)
Jesus, the heavenly high priest in the true Tabernacle in heaven who gave the once-for-all sacrifice, is the reality that matters. Everything else is a copy intended to point to him. Here we are again at one of those 180° turns. What we think is reality is only a shadow. What is reality is unseen and seemingly shadowy. Plato would like this!