There are many factors that people should remember in order to be successful. Making effort, trying hard, keeping up the positive attitude, and being intelligent can be included in those factors. Of all these requirements, I would say that having positive attitude is the most important characteristic of people who want to be successful. In the following essay, I will further explain as to why I think so. 
To begin with, being positive lets you be confident, which eventually leads to become what you want. For instance, let’s say a middle school student failed her mid term exam. If she is not an affirmative person, she would probably give up and do not study anymore for her final test. However, if she has a positive attitude toward every situation she confronts, she will try harder and possibly get a better score next time. Which case will bring a brighter result? 
Next, having a positive attitude can let people be healthy, which is also essential to live successful lives. Negative people are subject to get tired and worried easily, which distract their healthy conditions. On the contrary, people who are affirmative will quickly forget about their problems and try a new attempt. Clearly, positive people are much healthier than those who are not and therefore are easier to become what they want.