Why is it good to say that a person is in a good mood and bad is bad? Why is this?

Depends on what you think. You know a blessing in disguise is a blessing in disguise. Why can he be optimistic about gains and losses? If you look at everything optimistically, you will get unexpected gains. Everyone has a bad mood, and no one will smile every day. Happiness is a day, sadness is a day. Why not walk happily to this day? What's bothering you? Talk to friends, or come here to give you advice. In fact, some things are very annoying. Don't always think about it, so it won't be so annoying. Be optimistic, there are still many things to worry about in the future. When you should do something, do it seriously, and don't always remember what you shouldn't think.