I've been reading Seth Godin's blog ever since I watched a pretty great video of a presentation that he gave to a group of engineers at Google. That talk (and his blog) center on marketing, but he's a fantastic speaker and writer, and all too often his topics apply to so much more...
Here's a great quote from a post he made yesterday, entitled "No" to Average
This is scary. It's really scary to turn down most (the average) of what comes your way and hold out for the remarkable opportunities. Scary to quit your job at an average company doing average work just because you know that if you stay, you'll end up just like them. Scary to go way out on an edge and intentionally make what you do unattractive to some.
Which is why it's such a great opportunity.