Yes, believing in yourself means having confidence, and confidence will get better and better; Positive people see an opportunity in every worry, while negative people see some kind of worry in every opportunity. A great man is great because when he is in adversity with others, others lose confidence, but he is determined to achieve his goal. There is no despair in the world, only desperate people. You'd better learn something when you feel sad and miserable. Learning will make you invincible forever.
Man can do it because he believes. The strength developed by a person with faith is greater than that of 99 people who are only interested.