Sins and misdeeds are not only forgiven but forgotten through Christ

Hebrews 10:1-18
Those sacrifices are an annual reminder of sins, because it is impossible for the blood of bulls and goats to take away sins.
By that will, we have been made holy through the sacrifice of the body of Jesus Christ once for all.
When this priest had offered for all time one sacrifice for sins, he sat down at the right hand of God. Because by one sacrifice he has made perfect forever those who are being made holy.
Psalm 40:6-8 Sacrifice and offering you did not desire, but a body you prepare for me; with burnt offerings and sin offerings you were not please. Then I said,'Here I am -- it is written about me in the scroll - I have come to do your will, O God.'"
The writer continues to press home his point that the old repeated sacrifices could only remind people of their sins, not remove them. What the law could not do, Christ has one. His offering is effective for ever. No further sacrifice is needed. Sins and misdeeds are not only forgiven but forgotten.
Why?
Jesus himself made perfect of sacrifice and remove our sins once forever. New covenant replaced the first covenant. God's word will put in our hearts,  write on our minds.
The cleanse of our sins is not only forgiven but forgotten, Salvation from Jesus Christ is completed.
How?
Jesus is the Lord, Jesus is my Savior, my rock, my fortress and my hope.