In a high school, each student is given a balloon, they write their own name on the balloon and put it out together in the hallway.
The teacher then mixes all the balls. Students were given 5 minutes to find their own bubble. Despite actively searching, no one found his ball. At that point, a teacher told the children to take any ball they could find and give it to the friend whose name was written on it. Just like that, within 5 minutes, everyone had their own bubble.

The teacher said to the students: "These balls are like happiness. We will find it very difficult to find if everyone is searching for their own. But if we care about the happiness of others, we will easily find our happiness a) What lessons do you learn from your teacher's words?