Most people can remember at least some painful experiences in their lives.
Most would agree that if the pain is not acknowledged, processed, and released, then they will continue to live with it until it is healed. That is the reason why there are so many helping and healing professions in the world today - such psychiatrists, psychologists, therapists, counselors, etc. These professions exist to help people through their pain. Before these professions existed, people suffered pain and often had no outlet for healing it. Just as people carry the pain they suffered earlier in their current life to their later years, people carry their pain with them from one life to another.