This phrase is partially true. As there are two sides to the coin, so does this case. Worrying about things is right but just worrying isn’t enough. However, it is a fact that worrying after a limit may harm one’s ability to be productive. Worrying does not necessarily prevent someone from achieving their goals. But in many cases when people worry about things they are prepared for it and are motivated to give their best.
While for someone who is a warrior, they are confident, fearless, and determined but that always doesn’t guarantee success. It all depends on different factors like your preparation, strategy, dedication, and courage to take risks. However, being a warrior doesn’t guarantee success, but your dedication and hard work do.
Also, warriors fight in wars without caring about their life, and they make their king win, but when they are martyred on the battlefield, they lose their life. And worrying too much sometimes ruins one’s relationship, and rapport with others as this behavior makes others feel uncomfortable.
In conclusion, you should know what emotion should be used in what quantity.