THE SPIRIT AND CLEANSING. Sinners are represented in the Scriptures as defiled or polluted by sin. To wash away the sins denotes the purifying of the soul from this pollution.
Some of you were like this; but you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God (1 Corinthians 6:11).
He saved us—not by works of righteousness that we had done, but according to His mercy, through the washing of regeneration and renewal by the Holy Spirit (Titus 3:5).
THE SPIRIT AND CONSCIENCE. The cleansing of the Spirit produces a clear conscience, something an OT saint did not experience.
For if the blood of goats and bulls and the ashes of a heifer sprinkling those who are defiled, sanctify for the purification of the flesh, 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 9:14).
Supernaturally, the Holy Spirit applies the blood of Christ to cleanse our conscience and wash away our sins, which is performed repeatedly in order to maintain fellowship with Father and Son.
If we say, “We have no sin,” we are deceiving ourselves, and the truth is not in us. If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrighteousness. If we say, “We have not sinned,” we make Him a liar, and His word is not in us (1 John 1:8-10).