It's difficult to offer a reflection on this passage of scripture without first contemplating it's place in the bible. The book of Hebrews was written to explain the glorification of Jesus Christ - His place in God's kingdom and what He accomplished on the cross. It really is that simple, but the author gets into minute details and this passage is one of them.
He goes into detail of how atonement was made for the Jews by their priests. It seems to us to be so foreign... so... complicated. It's so hard for us to relate to an ancient process that is, well, ancient. How is that relevant to us today? Why should we care?
I think the answer is that there is a lot in scripture that is ancient. Some of it is there to point to the coming of Christ (such as in the Hebrew scriptures of the Old Testament) and some of it is there to tell us exactly who Christ is (the Gospels) and what Jesus Christ continues to do in the world (the letters of the New Testament).
In this passage it really shows us the Amazing Grace that Jesus Christ brings - the need for a priest to offer sacrifice on our behalf is no more... the need for a Holy of Holies where only the High Priest can go with his sacrifice is no more... the need for curtains dividing the people from God Himself is no more... the need for fear and trembling before God is no more... because God Himself as revealed in his Son for US, for OUR SINS has covered every sin, every blemish, every wrongdoing, every mistake. Our access to God, our loving God is open - without fear, knowing the Grace and Love that God has shown to us and made our Relationship with God possible. Thanks be to God for his great sacrifice and for opening to us the freedom to enter the Holy of Holies and to be in the presence of God ourselves with Jesus Christ as our only Mediator and Advocate.