I have previously written on the importance of forgiving others who have offended or injured us in some what, but what about ourselves?  DO we need to forgive ourselves and should we?  The answer to both is "yes".  
    Even very egotistical people often blame themselves for thing's that were not really their fault and the rest of us do it even more often.  We blame ourselves when we accidentally insult another person.  We blame ourselves when we fail to do things we should do, or think we should.  We blame ourselves when we don't live up to the desires or expectations or our parents, teachers. bosses and spouses.  Very masochistic people blame themselves for just about everything including bad weather.  "It wouldn't have rained if I had remembered to pray for sunshine".  
    Of course we should recognize when we do something wrong and should strive to do better in the future, but we also need to forgive ourselves.  We are human and we will make mistakes, but we move on.  We shouldn't allow ourselves to get caught up in guilt.  When we get caught up in guilt, we think we are not worthy to have good things happen to us and that literally programs our subconscious mind to prevent good things from happening.  For those seeking spiritual enlightenment, how can you achieve it if your feelings of guilt make you think you are not worthy of enlightenment?  Obviously, you can't so you need to get rid of that idea.  A simple rule of thumb that I think is reasonable.  If you have developed a desire to become spiritually enlightened, you are worthy, otherwise, you would not be considering it.