A Washed Conscience from a Baby in a Manger

This is being posted for Christmas, 2019. We will talk a lot about the birth of Christ today. But I want to talk about why it matters that Jesus was born. Why did God the Son come into this world to live among us?

"Baptism, which corresponds to this [Noah and the Flood, verse 20], now saves you, not as a removal of dirt from the body but as an appeal to God for a good conscience, through the resurrection of Jesus Christ" (I Peter 3:21). If you saw that verse and assumed that I would be talking about baptism, then you experienced what I am about the describe, the frequent failure to read the rest of the verse. Notice that Peter mentions baptism, but then adds " not the removal of dirt from the body." Note that he compares it to Noah, who avoided being in the water. So, his point is not about baptism, but about what baptism represents, "a good conscience." How does the sinner achieve a good conscience, as represented by the water applied to his body?

Why?

The writer of Hebrews makes a similar point: "Since the law has but a shadow of the good things to come instead of the true form of these realities, it can never, by the same sacrifices that are continually offered every year, make perfect those who draw near. Otherwise, would they not have ceased to be offered, since the worshipers, having once been cleansed, would no longer have any consciousness of sins? But in these sacrifices there is a reminder of sins every year. For it is impossible for the blood of bulls and goats to take away sins" (Hebrews 10:1-4). The Old Testament sacrifices were insufficient because they had to be repeated. The blood of the sacrifices never removed sin or changed the nature of those who performed them. Instead, "we have been sanctified through the offering of the body of Jesus Christ once for all" (verse 10). And "by a single offering he has perfected for all time those who are being sanctified" (verse 14). 

That is why Christianity, though built on the foundation of the Old Testament religion of Moses, is far superior. The types and shadows have been removed, so that we can have a direct view of the one-time sacrifice of Jesus: "So let us draw near with a true heart in full assurance of faith, with our hearts sprinkled clean from an evil conscience and our bodies washed with pure water" (verse 22; see also Hebrews 9:14). Notice that the writer of this epistle uses the same baptismal imagery to describe the application of the blood of Christ to the believer by faith.

"When God can be just and faithful in blotting out his transgressions, then, and not until then, is his conscience sprinkled with clean water and purged from dead works. Christianity must take away our guilt, or it leaves us under the curse of nature" (James Henley Thornwell, "The Necessity and Nature of Christianity").