It probably depends on what the old grudges is, but lately I have been having like these ceremonies writing what hurt, what can I do to not let it happen again, what was actually okay, let's say if it was a relationship...I decided to just let it all go forgive and not let it anger me again.....Some things are to teach you how to avoid those disappointments again, so I cut it off right before I know it will end up that way so I don't have to worry about grudges.....