The purging of our guilt and sin is found in the blood of Christ, mercy and truth.  Our heart and mind is cleared from the unwanted feelings, memories and condition of sin by the blood.

Proverbs 16:6 By mercy and truth iniquity is purged: and by the fear of the Lord men depart from evil.

Purge – To clear from guilt or moral defilement; as,to purge one of guilt or crime; to purge away sin. Webster 1828 Dictionary

Purged – rid (someone) of an unwanted feeling, memory, or condition. – Oxford English Dictionary

The Blood of Christ

When our sin is washed away by the blood of the Lord Jesus Christ, we are made whole and our iniquity is purged.  We are free from guilt.  We are free from the defilement of our sin.  God separates our sin from us as far as the east is from the west.  When our sin is purged, there is a clearing of our conscience. It can rid us from the unwanted feeling, memories and conditions of our sin.  Sin can have a devastating effect on the make up of a man.  The consequences can effect us for a long time.  But the blood of Jesus Christ has a cleansing affect.  It can help clear the mind of guilt and shame.  It also removes the eternal ramifications of our sin, which is an eternity in hell.

Mercy

Mercy can purge or clear us of our sin as well.  When the Lord has mercy on us, we do not get the punishment we deserve.  When we have mercy on others, it helps to cover a multitude of sin.  There is a comfort in forgiveness.  We can have longsuffering on others and show kindness when they might deserve wrath and condemnation.  By having longsuffering and kindness, we help to purge the effects and thoughts of that sin.  We help to erase the unwanted feelings and memory of that sin.  Charity towards others is always the best approach.  It is the most Christ like response.

Truth

Truth can also purge sin.  You have to admit your sin to have forgiveness.  If someone is unrepentant about their sin, there can be no purging.  We have to admit our sin to have the blood of Christ applied.  Lying or deceit about our sin will only cover it up.  It will not deal with it.  If you cover your sin, you cannot prosper.  There is no greater truth than the Word of God.  We must come to the Bible for answers to be purged and cleansed from the effects of our sin.  The Word has a cleansing effect on the soul.  You need to bath in it’s truths regularly.