Life needs positive energy. A person’s life is a road with lots of difficulties and various negative emotions. Everyone will have the desperate time. Positive energy can help us go through this period of time. For example， I am sad about the exam yesterday. But an optimistic classmate encourages me to think in a good way and comfort me. I can recover soon. But if she also is as pessimistic as me， I won’t have recovered so quickly. Maybe I will be sad for a long time. There are many similar things happening in our life. To live a better life， we need positive energy.