19.What does the blood of Christ purge purify?

Our conscience from dead works.

The "dead works" spoken of here refer to the Levitical ordinances and regulations, including the blood sacrifices and the regulations concerning food, drink, various washings, and the other directives concerning bodily behaviour.

It appears that the contrast is between the Levitical ordinances and the "living" God. However, there also may be the idea of works of sin being purged from our conscience. Putting the two together, we have the thought of the sin in us leading to spiritual death because of the defilement of our conscience due to our inability to observe all the commandments of the Law.

Our conscience having been relieved of the burden of guilt, we now are free in our mind to serve God apart from the ordinances of the Law.