In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Ripping
To rip your clothes in a dream means there will be arguments and tension but you will manage to overcome the problems and difficulties in your life. To tear letters and paper means you will hear great news.