Forget The Past And Move On

A wise man once sat in the audience and cracked a joke. All laughed like crazy. After a moment, he cracked the same joke again and a little less people laughed this time. He cracked the same joke again and again, when there was no laughter in the crowd, he smiled and said, "When you can't laugh on the same joke again and again, then why do you keep crying over the same thing over and over again?