If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.
Of course, some novels also subvert this delightfully. Patricia Wrede's The Seven Towers, for instance, is all about exactly what goes wrong when you try to make a magical object out of pure good.
(Edit: that is, Wrede does not literally spend the whole book talking about this problem. It is merely mentioned as backstory. But still.)