"You can't put a limit on anything. The more you dream, the farther you get."          
      - Michael Phelps 24 olympic                 medals (18 gold)

I think this quote means that you can always keep going in life. There is no point in life were you can say that you can't accomplish more. THere will always be more to accomplish in life. I think it is also trying to say that the more things you have in your mind the more things you will accomplish. For example when Michael Phelps went to his first olympics he didn't say that he accomplished his goal of going to the olympics and that he was done accomplishing things. He checked going off to the olympics, but he kept on going to the olympics because he knew he could accomplish more. He went on to beat swimming records and on the last olympics he became the person with the most olympic medals. The point is that you are never really done in life there will always be more things you can accomplish.