believe后接两个that引导的宾语从句，结构工整，语气坚定。
The saddest thing in the world is having eyes yet seeing nothing, and having ears yet hearing nothing.
Doubt is acceptable, but verification is more important.
You must believe that you are unique and that you can definitely succeed.
If you are certain you are right, then walk your own path and let others talk.
Lack of self-confidence is often a key reason for weak character and professional failure.
The first and greatest obstacle to our success is a lack of self-confidence.
Courage and confidence are two sharp swords on the journey of life; frequently using courage will generate confidence.
世界上最可悲的事情，是有眼睛却熟视无睹，有耳朵却充耳不闻。
怀疑固然可以，但求证更加重要。
你一定要相信自己是独一无二的，自己一定能成功。
如果确定自己是对的，那就走自己的路，让别人去说吧。
缺乏自信常常是性格软弱和事业不能成功的重要原因。
阻碍我们成功的第一障碍，也是最大障碍，就是不自信。
勇气和信心是人生路上的两把利剑，勇气常常运用，就会生发出信心。