The books got turned down. Harry Potter didn't get published right away. Those people out there saying Potter was not good enough are the same people telling you your script sucks, or you should give up acting, or your camera-work is all wobbly. HARRY POTTER GOT REJECTED. Remember that every time you feel down or low about your career.
J. K. Rowling was just a woman on a train who had an idea and saw it through. She had a vision of writing seven books and she kept to that vision. Sure, now she's rich and we can be cynical - but she's just a creative woman who created magic. But it's not magic; it's just words on a page.
Harry Potter was just a seed of an idea in a woman's head. THAT'S ALL. But now, we know more about Harry Potter than we do about our government. We can recognize Daniel Radcliffe but sometimes we forget the names of our relatives. Harry Potter is everywhere. It's not just a cash-cow, it's a real life example of dreams coming to life, in so many ways. And I can't get over the fact it was all created by a writer who sat on a train and had an idea.
If you had been J. K. Rowling, on that train, and you'd had an idea about a kid with glasses who goes to wizard school-- I wonder, would you have seen it through? Would you have completed it? Would you have believed in yourself? Whether the answer is yes or no it doesn't really matter. It's just worth remembering the story of how Potter came to be. All of the directors, producers, financiers, marketing executives, actors, red carpet premieres, toys, screenings, etc -- it is ALL because J. K. Rowling sat on a train and had an idea.