One of the first classes I had to take for my Creative Writing degree was, oddly enough, "Intro to Creative Writing". It was a 100-level class that everyone with a Creative Writing major or minor had to take. Some of us would go on to have all our workshop classes together and several would either drop out or take poetry classes (not to disparage our poet sisteren). In that class, one extraordinarily mediocre writer was a girl right out of high school and a little on the heavyset side. She wrote a short story that was about someone killing themselves and made a point in class to mention how auto-biographical it was. I didn't say a word because what would have come out would not have been helpful to someone flirting with self-destruction and it was obvious she wasn't serious about it but was simply screaming out for attention by writing a "short story".
Our writing isn't therapy.
I realize that several of the greatest writers have had significant mental problems. They likely needed (or had) therapy. But you can't just unload your problems on your readers in a thinly-veiled attempt for validation and expect to call that "writing".
I mention this because I've been tossing this question around in my head. I've recently felt a tad grumpy about not having a soul in the world with which to have the kinds of theological discussions I have with myself. I read and listen to seminary classes on iTunesU and these new understandings pop up in front of me like a whack-a-mole and I just want to share them with someone because I'm excited to learn something new about the world or human nature or both. But people often find me tedious and roll their eyes when I start to speak and maybe harumph a "there he goes again." Then I think I'll just go off and write a short story about these things and that will be a sufficient outlet for me and I'll keep my big mouth shut in Sunday School because I just want to stay quiet and out-of-the-way and let someone else talk but I find I can't in the same way an alcoholic finds it nearly impossible to resist a shot of whiskey sitting on a table in front of him.
But people (and as a writer, our readers) don't really want to hear us think out loud. They want the distilled essence of what we've learned in the form of an allegory or a metaphor. They're not all that interested in listening to us develop our opinions in the same way you might if you were sitting in front of your therapist and she was wringing out of you things you didn't want wrung out but were wrung anyway and lo and behold you felt better afterward though it was like giving birth and then you realize what you actually think about things rather than either not knowing or deluding yourself into believing you think something else.
It's not a wonder, then, that my writing that's a result of this intent to "share" what I've learned feels wooden and didactic. I'm trying to use a bully pulpit as a counseling session and surprise, surprise it doesn't work that way.
Writers are necessarily doomed to trudge along burdened by the knowledge that they're curious about the world and want to learn new things and simply can't share that knowledge with anyone without being written off or talked about when they're not around because no one else but they are as interested in knowing what a writer desires to know. At some point we have to distill that understanding into something like a short story or a novel and maybe that will be sufficient to dig out the canker.
That's a pessimistic and somewhat narcissistic view of the world, I know, but writers are usually a morose lot, are we not?

