For all the writers who read this site, I want to direct your attention to a GREAT post on literary agent Nathan Bransford's blog, Ten Commandments for a Happy Writer. The advice is so sane, yet so encouraging. The list is well worth a read and deserves posting on every writer's bulletin board.
I think Commandments #4 and #9 are especially important to keep in mind as we struggle to make sense of our vocation, and I'm working hard on #3 myself.
Which commandment speaks the most to you at present?