Stop waste your time complaining

"People visit a wise man complaining about the same problems over again and again.one day he decided to tell them a joke and they all roared with laughter.
After a few minutes, he told them the same joke and only a few of them smiled.
Then he told the same joke for a third time, but no one can laughed or smiled anymore
The wise man smiled and said " you can't laugh at the same joke over and over so why are you crying about the same problem?"