What is the meaning of the phrase "purge your conscience from dead works" in Hebrews 9:14?

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What does “purge your conscience from dead works” mean in

Hebrews 9:14 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?

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1. What are dead works? Are they same or related to ones in

Hebrews 6:1 Therefore leaving the principles of the doctrine of Christ, let us go on unto perfection; not laying again the foundation
of repentance from dead works, and of faith toward God,

?

2. How does “dead works” affect conscience?

3. How does the blood purge our conscience from dead works?

4. How does such purging help us to serve the living God?