‘Which was a figure’ (and the Greek word there translated figure is not pattern as it usually is; it is parable) – ‘Which was a parable for the time then presents, in which were offered both gifts and sacrifices, that could not make him that did the service perfect as pertaining to the conscience.’ That seems a complex sentence, but it is very simple really.
Were the consciences of those Old Testament worshippers made perfect? Was their guilt truly and consciously, taken away? Not if they depended on the animal sacrifice to do it. The conscience cannot be deceived in this way. It speaks with authority to the soul, and no amount of self-deception is able to persuade it that sin has been forgiven in the absence of the assurance of God. The Israelite who went through the motions of outward religion and dutifully offered sacrifices according to the law, had the satisfaction of knowing that he had obeyed God to a certain point, but his or her guilt stubbornly remained at the end of these religious exercises. Conscience refuses to cease its accusations until it sees the blood of Christ and knows that God himself is satisfied with the offering. How wonderful is the peace that the newly converted Christian has! Having accused himself ceaselessly through out life, he has now come to a place he has never been before, where conscience has for the first time genuinely stopped accusing him. This cannot be achieved by any amount of psychological manipulation, promotion of self-esteem, or attempted reprogramming of conscience. It is a peace which comes only from the Holy Spirit, as he applies the blood of Christ to our hearts.