Have you ever want to become another person? Even if only one day, you can do as your wishes, no one will blame you, because they don’t know that person is you, being another person, how exciting! Just don't do it too long, perhaps you really become another person, but can’t change to yourself again. There is a book to share with you today “Jekyll and Hyde”. Dr Jekyll is a knowledgeable, respected celebrity with extraordinary ability in London. Jekyll drank a potion, then change himself into a evil man called Hyde, he hovered between good and evil all day long and his guilty feelings always tortured himself. Finally, he can’t bear the condemn from his heart, taking poisons to suicide. Actually, We all are people like Dr Jekyll, everyone has the evil side. We just can control ourselves; we have a rational mind to judge right and wrong. Our thinking dominates our behavior to do the things that is right. But sometimes, we also need a method to release emotions, and we need to choose a way that correct and appropriate. If not, we will also become Dr Jekyll, and feel repentant in lifetime. On the other hand, The source of happiness lies in being content with one's lot and being content in your heart. That is why rich men perhaps are not happy while the people in poverty could feel the matchless bliss. Contentment not means get the things you want, but value the things you have.