How do we know that Christ's sacrifice cleanses us from all sin?

The assurance of cleansing from sin through Christ's sacrifice is rooted in the promises of scripture, particularly in 1 John 1:9, which states that if we confess our sins, He is faithful and just to forgive us. This emphasizes that our cleansing is not based upon our actions or merits but solely on Christ's sacrificial work on the cross. The eternal nature of this promise highlights that no sin of the elect will remain unaddressed; they are fully cleansed and justified in Christ. Additionally, the cleansing's completeness is affirmed through the covenant of grace, ensuring that we are made whole and can walk in the light of His presence.