2 Corinthians 5:17

Therefore, if anyone is in Christ, he is a new creation; old things have passed away; behold, all things have become new.

New doesn’t have a memory of the past and is full of optimism and hope for the future.  New doesn’t carry the burdens from the past which would weigh it down and keep it from fulfilling God’s plan.  Every one of us who is born again has been made new.  So!  Why are we still looking back at the past?  If we haven’t changed from our old way that is one thing, but if we have changed we need to forget the past and stop thinking about those mistakes.