This audio clip of Ira Glass (This American Life) has been floating around for awhile.
I hear it quoted a lot from creatives trying to inspire other creatives to keep working. It is a good motivator to hear someone as accomplished as Ira Glass admit that it took time to gain the skills that he has.
Out of all the video versions, I have seen, this one is my favorite.
It is created by Daniel Sax, and you can see some of his other videos on Vimeo.
I hope this video inspires you (as it does me) to keep creating and working on my craft.