"A blessing in disguise is a blessing in disguise" teaches us to be optimistic! In fact, smiling is a good medicine for all diseases. People who often smile are actually very popular. People like happiness, and naturally they like happy people. Even if you are in a bad mood, laugh it off. If you can't smile, at least don't keep a straight face, because once you leave a bad impression on others, your character will be reduced accordingly. Learning to forget may be a compulsory course for a person to study all his life. Everyone has their own unhappy things. If you keep remembering it, your mood will be greatly affected in the end. There are actually many ways to forget. You can do something to divert your attention, forget your former lover and find a new beginning. Although it takes time, it doesn't mean you can't forget it. When you really learn and become harmless, you will feel that the whole world will give you warmth and happiness.