Made me reflect, but ...
"Would someone go to Wimbeldon to play one match? Become a heart surgeon just to do one open-heart surgery and then go back to his regular life? Would someone go to law school to try just one case in court? Or go through all the trouble of opening a coffee shop to stay open for one day?"- Heather Sellers, Chapter after Chapter
My response is "Yes! I would", it is who I am. Some days, I feel I really need to be more passionate about one thing, rather than interested in many things.
You can read a sample chapter (chapter 7) here. It is a pdf, so you might want to right click and download it first (for Windows users, I have no idea how a Mac user would do it). Loved the second and third paragraph on the second page.
[Updated 02-July-2008 @ 10:27: provided link to author's site selling the book (no, I don't get any commission). Also added paragraph and link pointing to sample chapter pdf].