A wise and knowledgeable man held a seminar to teach people how to get rid of sorrows in their life. Many people gathered to hear the wise man’s words. The man entered the room and to start his seminar he told a very funny joke and everyone roared with laughter.
After a couple of minutes he told them the same joke and only a few of them smiled or laughed and when he told the same joke for the third time no one laughed.
The wise man smiled and said . . . 'You can't laugh at the same joke over and over. So why do you cry over the same problem over and over?'