Forgiveness.

Someone was talking about forgiveness on a DVD today. It got me thinking. When you look back on life some people pop into your head and you can still feel a certain amount of resentment about their approach/what they did/said that made you feel bad however many years ago.
Given time you don't focus so much on these upsets but I have realised that unless you actively forgive the person for the hurt/upset caused the feelings get buried but never really go away.
I have realised this recently. If you think back to a time when you felt unfairly treated or hurt by someone the memories kick-start feelings of upset that bring you right back to the time in question unless you learn to forgive, forget and let go.
I know this is easier said than done but I feel that it works. I think that you forgive for yourself as much as for them. Forgiveness is a cleansing process that allows you to move forward in a carefree way.