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.
If they had, the worshipers would have gone merrily on their way, no longer dragged down by their sins.
But instead of removing awareness of sin, when those animal sacrifices were repeated over and over they actually heightened awareness and guilt.
The plain fact is that bull and goat blood can't get rid of sin.
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's not fragrance and smoke from the altar that whet your appetite.
So I said, "I'm here to do it your way, O God, the way it's described in your Book."
When he said, "You don't want sacrifices and offerings," he was referring to practices according to the old plan.
When he added, "I'm here to do it your way," he set aside the first in order to enact the new plan -
God's way - by which we are made fit for God by the once-for-all sacrifice of Jesus.