Some people believe that what they think and do was correct. They will take revenge against each and very word. There are not relies that they are ruining their happiness by wasting time,money. Did god ask us to take revenge? No. They didn't have a life. They are living to fulfill their revenge towards others. No happiness, enjoyment, trips,no sleep and presence of mind. They are living to do revenge, no life and happiness. Some people will never allow others to be happy. Creates problems in each and very thing.