I agree with Creeper, the self-doubt idea is good, we all have that feeling of "am I really ever going to become a Theory 11 artist?" form time to time.
Another good one is "Magic". Not the art, but the word in relation to the art. When ever I tell someone I know well that I do magic, or Im a magician, I can always tell what theire thinking, "Oh this kid is going to get out a magic wand and pull a bunny out of a hat, great...." . So I always hate intruducing myself as a magician, or saying that I do magic, because it gives off that bunny-out-of-a-hat vibe. I also HATE it when my brother says "oooo maaagic...." and widens his eyes and wiggles his fingers. Daniel Madision talks about this (not my brother, even though his name is daniel as well, but the first thing), and what he says is very intelligant, and I toattly agree with him. Every magician in the world should watch this video. Ill post a link at the end, or you could look it up cause its on theory11. Anyway, the best thing he says in this video is, "Magic is dead." and youll see why I agree completly when you watch this....
http://media.theory11.com/1301-dM---Artist-Manifesto-Part-II[/URL]
I also suggets watching the first on as well, "Daniel Madison Artist Manifesto" search it in the t11 search bar. They are both dead on, but I like #2 better.