The quote implies that you must do something in order for your wish to come true. Because the world is not like the cartoons that you've watched. You don't have Doraemon, that can give you the things that you need. You don't have a fairy godmother that can give you a dress. You don't have a Ginnie like in Aladdin that can grant anything you wish.
So, you must work hard and do something to make everything come true. Dream big and work hard.
