Hebrews 9:11-14 (ESV)
But when Christ appeared as a high priest of the good things that have come, then through the greater and more perfect tent (not made with hands, that is, not of this creation)  he entered once for all into the holy places, not by means of the blood of goats and calves but by means of his own blood, thus securing an eternal redemption.  For if the sprinkling of defiled persons with the blood of goats and bulls and with the ashes of a heifer sanctifies for the purification of the flesh,  how much more will the blood of Christ, who through the eternal Spirit offered himself without blemish to God, purify our conscience from dead works to serve the living God.
Purify our conscience from dead works to serve the living God. I don’t know why it has taken up until now for me to see this term “dead works.” It I think express clearly the vanity of modern Christendom, dead works. Everywhere you turn everyone is afraid of dead faith, faith that doesn’t produce works. So they turn to the law and hammer on works, and forget the gospel the minute they are done mangling it with the sinner’s prayer. They turn you back to dead works. Dead works are the produce of the law, a dead tree cannot bear living fruit. Law it was what drove us before we heard the gospel; it cannot be our motivator for works now. But our conscience purified by the blood of Christ, jettisons dead works, to serve the living God in faith and love. No longer do we need to look to our works for salvation, we have the blood of Christ. And in the love that shed that blood we live, producing the fruit of the gospel, often times in the same works we did before. The blood that invigorates our conscience, breathes life into our works.