Therefore, since we also have such a large cloud of witnesses surrounding us, let us lay aside every weight and the sin that so easily ensnares us. Let us run with endurance the race that lies before us, 2 keeping our eyes on Jesus, the source and perfecter of our faith, who for the joy that lay before Him endured a cross and despised the shame and has sat down at the right hand of God’s throne. 3 For consider Him who endured such hostility from sinners against Himself, so that you won’t grow weary and lose heart. (Hebrews 12)
When you allow Him to love you, you will hear Him impress on you that it is only by His blood that He can give you a clear conscience.
Now the first covenant also had regulations for ministry and an earthly sanctuary. 2 For a tabernacle was set up, and in the first room, which is called the holy place, were the lampstand, the table, and the presentation loaves. 3 Behind the second curtain, the tabernacle was called the most holy place…
6 With these things set up this way, the priests enter the first room repeatedly, performing their ministry. 7 But the high priest alone enters the second room, and he does that only once a year, and never without blood, which he offers for himself and for the sins of the people committed in ignorance. 8 The Holy Spirit was making it clear that the way into the most holy place had not yet been disclosed while the first tabernacle was still standing. 9 This is a symbol for the present time, during which gifts and sacrifices are offered that cannot perfect the worshiper’s conscience. (Hebrews 9)
All the practices and regulations dealt with the outside. They existed until a better way was provided:
11 But the Messiah has appeared, high priest of the good things that have come. In the greater and more perfect tabernacle not made with hands (that is, not of this creation), 12 He entered the most holy place once for all, not by the blood of goats and calves, but by His own blood, having obtained eternal redemption. 13 For if the blood of goats and bulls and the ashes of a young cow, sprinkling those who are defiled, sanctify for the purification of the flesh, 14 how much more will the blood of the Messiah, who through the eternal Spirit offered Himself without blemish to God, cleanse our consciences from dead works to serve the living God? (Hebrews 9)
Dead works are the things that come from within us… lust, jealousy, apathy, fear…
He told them, “Listen to Me, all of you, and understand: 15 Nothing that goes into a person from outside can defile him, but the things that come out of a person are what defile him. [16 If anyone has ears to hear, he should listen!]” 17 When He went into the house away from the crowd, the disciples asked Him about the parable. 18 And He said to them, “Are you also as lacking in understanding? Don’t you realize that nothing going into a man from the outside can defile him? 19 For it doesn’t go into his heart but into the stomach and is eliminated.” (As a result, He made all foods clean.) 20 Then He said, “What comes out of a person—that defiles him.21 For from within, out of people’s hearts, come evil thoughts, sexual immoralities, thefts, murders, 22 adulteries, greed, evil actions, deceit, promiscuity, stinginess, blasphemy, pride, and foolishness. 23 All these evil things come from within and defile a person.” (Mark 7)
When you do not have a clear conscience, it consumes you. It affects everything in our lives.
The blood of Jesus — we don’t deserve it. We cannot earn it. But we require it.