One possible version：
Happiness
Happiness means different things to different people. For example, some students believe that if they have much money or large possessions, they will be happy. They believe that they will be able to do anything they want to if they have much money. Some students think that they should be in good health, and do whatever they like. Many students wish to have much wealth from their parents. In this way, they don’t have to work hard, and they can own everything.
I don’t agree with the above points. I don’t think money means happiness. We can’t buy many of the things with money, such as health, happiness and knowledge. I value knowledge, which makes me happy, for I can do much for mankind with knowledge. Although different people value happiness differently, my “wealth” of happiness is in my study.