Hebrews 10:2

‘Else would they not have ceased to be offered? because the worshippers, having been once cleansed, would have had no more consciousness of sins.'

And this lack must be true for if they had not been shadows, would they not have accomplished their end? If the worshippers had been truly cleansed, would the sacrifices not have ceased to be offered? Would the worshippers then not have ceased to be conscious of their sins because they had been truly atoned for? The very continuing repetition of the sacrifices, revealing a continuing consciousness of sin, also revealed the failure of their offerings and sacrifices to deal with sin. The necessity for continuing repairs is an evidence of continuing failure.

We should especially note here a very important point. What the writer has in mind is the final solution. What man needs is not just something to make his daily life possible in spite of his sin, but something which can once-for-all put man in such a state that he can continually approach God without fear for ever, something that can be finally effective.