The type is small but it reads:
A professor gave a balloon to every student, who had to inflate it, write their name on it and throw it in the hallway.
The professors then mixed all the balloons. The students were given 5 minutes to find their own balloon. Despite a hectic search, NO one student found their balloon. The professors then instructed the students to take the first balloon they can get and hand it to the person whose name was written on it. Within five minutes each student had their own balloon.
The professors then said the following:
“These balloons are like happiness. We will never find it if everyone is looking for their own. But if we care for other people’s happiness, we find our own, too”.