We are not left in a continual state of mourning over our sin.  God graciously lifts us up.  "Humble yourselves in the sight of the Lord and he will lift you up" (James 4:10). 
If we sincerely ask to be forgiven, he forgives us completely.  He removes the sin and unrighteousness from us (proverbs 28:13; Romans 10:10; 1John 1:9).
 
