Found at Aspiring Community:
 

                                    Changing The World
                                                                                              (Unknown Monk 1100AD)

      When I was a young man, I wanted to change the world.  I found it was difficult to change the world,
      so I tried to change my nation. When I found I couldn't change the nation, I began to focus on my
      town. I couldn't change the town and as an older man, I tried to change my family. Now, as an old
      man, I realize the only thing I can change is myself, and suddenly I realize that if long ago I had
      changed myself, I could have made an impact on my family. My family and I could have made an
      impact on our town. Their impact could have changed the nation and I could indeed have changed
      the world.