【正确答案】Undoubtedly, confidence is important to achieve success. With confidence, one can overcome difficulty and achieve the final goal on the way to success. If one has no confidence, one has little hope to fulfill anything. There are some people who always lack confidence. They often feel unconfident and depressed even though they are capable of doing something.
Why? As far as I am concerned, there are mainly two reasons. On the one hand, they can't make correct evaluation of themselves. They dare not to try something challenging, lacking confidence in themselves. On the other hand, they may overestimate the difficulties and fail to develop an effective recognition.
As to how to build up confidence, I have the following suggestions. First of all, one should have a correct attitude towards his or her ability, neither underestimating nor overestimating it. Secondly, as everyone has setbacks to contend with, treat them as good opportunities to strengthen yourself. Finally, keep in mind that no one is perfect, and learn to accept the fact that life is full of ups and downs.