The Mosaic Law and its corresponding religious system which was put in place when the Israelites were delivered from bondage in Egypt were only meant to be an example of God’s forgiveness of sins. They were a foreshadowing of things that were to take place in the future. The writer of the book of Hebrews pointed out that a physical system of sacrifice was flawed because it could not permanently remove the effects of sin (Hebrews 8:7-9). He explained, “Now when these things were thus ordained, the priests went always into the first tabernacle, accomplishing the service of God. But into the second went the high priest alone once every year, not without blood, which he offered for himself, and for the errors of the people: the Holy Ghost this signifying, that the way into the holiest of all was not yet made manifest, while as the first tabernacle was yet standing: which was a figure for the time then present, in which were offered both gifts and sacrifices, that could not make him that did the service perfect, as pertaining to the conscience” (Hebrews 9:6-9)
The ultimate goal of God’s plan of salvation was the perfecting of the human conscience. The Greek word translated conscience in Hebrews 9:9 is suneidesis (soon-i’-day-sis). “Suneidesis literally means ‘a-knowing,’ a co-knowledge with one’s self, the witness borne to one’s conduct by conscience, that faculty by which we apprehend the will of God, as that which is designed to govern our lives. The word is stressing that we receive input from our surroundings [temptations, decision-making events, etc.] and we are driven to make a decision. We compare what we know with our conscience [con — ‘with’ , science — ‘knowledge’], our knowledge base about this input. If we follow our conscience we act according to what we know to be true about the situation and the consequences/blessings of our decision. We can violate our conscience by overriding that knowledge” (G4893). The reason why the New Covenant was a better covenant was because God said that he would “put my laws into their mind, and write them in their hearts” (Hebrews 8:10). When we are born again, God gives us the ability to discern his will and through the indwelling of the Holy Spirit, the power to do what our conscience tells us to.
The effect of Jesus’ death on the cross was a complete cleansing or purging of guilt from every believer’s heart. The writer of Hebrews explained that the blood of Jesus was able to do what the blood of animal sacrifices could not. He said, “For if the blood of bulls and goats, and the ashes of a heifer sprinkling the unclean, sanctifieth to the purifying of the flesh: how much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?” (Hebrews 9:13-14). Jesus’ sacrifice of himself was able to “remove sin’s defilement from the very core of our beings” (note on Hebrews 9:14). The key to accomplishing this was Jesus’ entrance into heaven and appearance before God as the intercessor for all mankind. It says in Hebrews 9:26-28, “But now once in the end of the world hath he appeared to put away sin by the sacrifice of himself. And as it is appointed unto men once to die, but after this the judgement: so Christ was once offered to bear the sins of many; and unto them that look for him shall he appear the second time without sin unto salvation.”