Neither by the blood of goats and calves, but by His own blood He entered in once into the holy place, having obtained eternal redemption for us. – Hebrews 9:12

This precious blood has this property about it, that, if the peace which it first causes should become a little dim, you have only to go to the precious blood to have that peace once more restored to you…That blood gives the pardoned sinner access with boldness to God Himself. That blood, having taken away the guilt of sin, operates in a sanctifying manner, and takes away the power of sin, and the pardoned man does not live as he lived before he was pardoned. He loves God, who has forgiven him so much, and that love makes him enquire, “What shall I do for God, who has done so much for me” Then he begins to purge himself of his old habits. He finds that the pleasures that once were sweet to him are sweet no more. “Away ye go,” he says to his old companions; “but I cannot go with you to hell.” Having a new heart, a new love, a new desire, he begins to mix with God’s people. He searches God’s Word. He makes haste to keep God’s commandments. His desires are holy and heavenly, and he pants for the time when he shall get rid of all sin, shall be quite like Christ, and shall be taken away to dwell for ever where Jesus is. Oh! the blood of Christ is a blessed sin-killer. They say that St. Patrick drove all the snakes out of Ireland. Ah! but Christ drives all the serpents out of the human heart when He once gets in. If He does but sprinkle His blood upon our hearts, we become new men, such new men as all the rules of morality could not have made us, such new men as they are who, robed in white, day without night, sing Jehovah’s praise before His throne. – C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3293.cfm