"For the Law,
since it has only a shadow
of the good things to come
and not the very form of things,
can never, by the same sacrifices
which they offer continually
year by year,
make perfect those who draw near.
Otherwise would they not have ceased to be offered,
because the worshipers, having once been cleansed,
would no longer have had consciousness of sins?
But in those sacrifices there is a reminder of sins
year by year.
For it is impossible
for the blood of bulls and goats
to take away sins."
How do we speak of a mosaic nowadays? It is an art piece made from broken things. The Mosaic Law is made of broken things as well. The pieces, beautiful as they may have been, are useless in and of themselves. They cannot hold water. They have been shattered.
The Law is but a shadow. There is one way to be rid of a shadow, for the sun to be directly overhead. Do you get the picture? When the Son is directly shining into our lives, there is no shadow. The Law was "only a shadow of the good things to come."
Good things did come: Christ and all He came to bring,
salvation--justification (being made just as if I did not sin)
and purification--sanctification with a clean heart.
"Therefore there is now no condemnation
for those who are in Christ Jesus
For the law of the Spirit of life
in Christ Jesus has set you free
from the law of sin and death.
For what the Law could not do,
weak as it was through the flesh,
God did: sending His own Son
in the likeness of sinful flesh
and as an offering for sin,
He condemned sin in the flesh,
so that the requirement of the Law
might be fulfilled in us,
who do not walk according to the flesh
but according to the Spirit."
Adam Clarke says, "The Gospel is the image or thing itself,
as including every spiritual and eternal good.
"can never make perfect
...it impossible for the blood of bulls and goats
to take away sin."
These sacrifices, year after year,
"Cannot remove guilt from the conscience,
or impurity from the heart." (Adam Clarke)
So, if these, the shadowy things of sacrifices year after year, were ineffectual, then it is the promise of something better which is to be, "the blood of the Lamb of God which takes away the sin of the world." The writer to the Hebrews is thoroughly making the point to the Jewish Christians that indeed something better has come. Good things. He wants to bring them out of the shadow into the light and to keep them walking in the light so that the shadow is always behind them.
Andrew Murray says, "The priest can never make perfect them that draw nigh. This is what Christ can do. He makes the conscience perfect...a conscience that, once cleansed in the same power in which the blood was once shed, knows how completely sin has been put away...He takes away not only guilt but sins, and that in such power of the endless life that those that draw nigh are made perfect, that there is no more conscience of sins, that there be no more remembrance of sins...a walk with a perfect conscience before God." It is not that we can forget our sin on this side of glory, but God can, and He makes any memory of sin free of guilt and condemnation giving us that perfect conscience.