Stop wasting your time complaining

"People visit a wise man complaining about the same problems over and over 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 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 always crying about the same problem?'"