Superstition and the written word

I've had the opening line for another Clans book running in my head, but I'm afraid to start it until I have Sacrifice finished. My writing is a fragile thing, or perhaps I'm simply superstitious. I'm nervous to start something new in the middle of working on something else, for fear that the original project never gets completed. I've made a mental note about this opening line, but I can't bring myself to even put it on a page for fear of upsetting my muse's internal balance.

I used to describe the stories as I was preparing to write them, but that was disastrous. Once the words left my lips, they left my head, and I was never able to get them back. Now I have to hoard my words like a miser, keeping them a deep, dark secret until I'm able to reveal them in a finished work. I'm even hesitant to tell acquaintances the title of the work in progress. It's ridiculous, and I'm far too precious about it, but I've been so disappointed in the past...perhaps I'm going to absurd lengths to stave off more sorrow.

I wonder if other writers have superstitions about their work. I have more than my share. I'm convinced that if I take a break from writing a new book before it reaches page 15, I'll never finish. I'm equally convinced that if I can just finish three chapters, I'll finish the whole. That's not always the case, though (Knight of Sorrows comes to mind, and I still tell myself I'll finish that). Still, despite the lack of probitive evidence, I persist in these tics and foibles until I drive myself nearly insane.

Maybe I don't want to stop the madness. Madness is, after all, the mother of some really awesome stories...