One possible version: 

                                              The importance of keeping a good mood

     People in modem society live under a lot of pressure from many aspects such as education, career and

family. It is important to keep a good mood in your daily life. In the following context I am going to justify

my point from two aspects.

     First, individually speaking, to keep a good mood makes everything easier to you. Just like the grease

smoothing a machine, keeping a good mood optimizes your life. If you are happy, work would not seem to

be that hard. You may learn to enjoy the process. Second, for the sake of people around you, you should

keep a good mood. If you are very cheerful every day, you are able to throw your positive influence upon

others who are also faced with varied pressure. Just like a shining sun, keeping a good mood enables you

to radiate your happiness to everyone around you and then they respond to you with an enlightening smile.

     To keep a good mood helps to start a positive recycle around you which may free pressure. Why not

meet your life with a smile?