How do we know the power of the blood is true?

The power of the blood of the Lamb is affirmed in Scripture, as it does indeed cleanse from all sin and provides the assurance needed to combat Satan's accusations. The application of this truth to the conscience is what brings comfort and hope to the weary soul. Additionally, the experience of many believers, who find strength and faith in the blood of Christ during trials, serves as a testament to its power. God communicates this power through the Holy Spirit, enabling believers to trust, hope, and love amidst struggles.