People will not change because we are holding feelings of resentment, anger, disappointments, and the like. What will change is us and can be seen physically and felt emotionally.
Researchers report forgiving someone for a transgression is less stressful to the body than holding a grudge. Whereas holding onto bitterness affects the healing rates of cardiovascular patients and their overall sense of wellness. (WebMD)
When we forgive and let go we change our thoughts. When we change our thoughts, our feelings change. When our feelings change our actions change and when our actions change we no longer carry yesterday’s baggage filled with hurts, regrets, etc.