In one's life, one usually has little understanding of oneself. When you succeed, you may be very happy. When you fail, you may be sad. If you don't get thorough (全面的)understanding of yourself, you may miss lots of (chance) in life.
To get a thorough understanding of yourself is to know well yourself. You may know your strong points and weak (one). You may hope for a wonderful future, but be sure not to expect too much you can't realize all dreams . You may be confident enough to meet challenges, but first you should know what to do.
To get a thorough understanding of yourself, you should believe yourself. Maybe you think you are not a much (tall) tree but just some smaller grass. If you get full confidence, you will be sure to face any trouble.
It also (need) to look after yourself if you want to understand yourself well enough. When you are angry, find a quiet place so that you won't be hurt. When you are sad, tell your friends about it (change) the bad mood(情绪) into a good one. When you are tired, get a good sleep. If you don't take good care of yourself, you won't be able to stay away from (ill).
So if you get a thorough understanding of yourself, you (get) a full control of yourself and find your life will be colorful.