When the Lord came to earth, He blotted out all sins once and for all. Many people do not know the Gospel so they still remain in their sins.
Those who now believe in the Gospel, confess that He shouldered all sin once and for all and that He has washed all our sins away by bearing the condemnation on the Cross.
Although the iniquities of the world continue incessantly, the believers, believe that He has blotted out all of the sins indefinitely with by the Gospel.
All must believe that the Lord who has clothed us in the righteousness of God that He has completed.