The old plan was only a hint of the good things in the new plan. Since that old "law plan" wasn't complete in itself, it couldn't complete those who followed it. No matter how many sacrifices were offered year after year, they never added up to a complete solution.
That is what is meant by this prophecy, put in the mouth of Christ: You don't want sacrifices and offerings year after year; you've prepared a body for me for a sacrifice.
It was a perfect sacrifice by a perfect person to perfect some very imperfect people. By that single offering, he did everything that needed to be done for everyone who takes part in the purifying process.
This new plan I'm making with Israel isn't going to be written on paper, isn't going to be chiseled in stone; This time "I'm writing out the plan in them, carving it on the lining of their hearts."
So, friends, we can now--without hesitation--walk right up to God, into "the Holy Place." Jesus has cleared the way by the blood of his sacrifice, acting as our priest before God. The "curtain" into God's presence is his body.
This is no light matter. God has warned us that he'll hold us to account and make us pay. He was quite explicit: "Vengeance is mine, and I won't overlook a thing," and, "God will judge his people."
If some friends went to prison, you stuck by them. If some enemies broke in and seized your goods, you let them go with a smile, knowing they couldn't touch your real treasure. Nothing they did bothered you, nothing set you back.