A dream is a wish your heart makes
When you're fast asleep
In dreams you lose your heartaches
Whatever you wish for, you keep
Have faith in your dreams and someday
Your rainbow will come smiling thru
No matter how your heart is grieving
If you keep on believing
The dream that you wish will come true
The words to this song could not be more true. If you can dream it, then you can do it... (That takes us to a whole other song to be covered at a different time).
The moral of the story here is that you should never stop dreaming, because if you can create it in your head, you can make it a reality. No one was better at this than Walt Disney himself. The parks are real life proof of his dreams come true. The empire he built rules the entertainment market still to this day. His dreams weren't of fame and fortune, but of a place where everyone can be happy and feel like they never have to grow up.
So keep dreaming, keep moving forward, and never grow up!