It is one of the devil's oldest tricks to discourage the saints by causing them to look back at what they were. No one will make progress with God until he lifts up his eyes and stops looking at himself. We are not to spend our time looking back and looking in - we are told to look forward! Our Lord is more than able to take care of our past. He pardons instantly and forgives completely. His blood makes us worthy - all we are and all we have is by the forgiving love of God!
A.W. Tozer
If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrighteousness. 1 John 1:9