We live among a group of human beings, and we wish to share our happiness and misfortune with other people in case those events fall upon us.
Human is different from animals which, unless they are in the childhood, will live independently. They have to find food and face disasters by themselves.
Our human life is to depend on each other to live on, food supply from farmers, house from workers and so on. Of course, we have to contribute what we can to the human society in exchange of service mutually.
In our daily life, when we have something happy or something misfortune, we wish to tell others hoping others to share our happiness or to minimize our feeling of misfortune.
However, to do this we need some control in its extent. We cannot tell our happiness to everybody, some of whom may not like to hear our happiness. Even some of them do not like us to be happy. Jealousy is human nature.
As far as misfortune is concerned, it is not necessary to tell everybody, most of whom will not care what we have suffered. Sad feeling of misfortune can only be circulated in our family members, and nothing to do with outsiders.
It is better no to tell others our happiness which will only lead jealousy against us and our misfortune can only bring gossip in their leisure time.