I couldn't decide from among the themes, so I ended up using them all. Given enough time and enough fear, I easily could have developed any one of the themes into a strong essay. But since neither time nor fear was on my side, the speech wandered from point to point with no logic that I could discern. An outline of my remarks would have resembled the tributary system of the Canadian River, without the Canadian River. A second reason writers make poor public speakers has to do with the rhetorician's art.
Nobody wants to hear someone stand up and read from a manuscript.
That's about as exciting as watching paint dry. The best public speakers work from notes, glancing down occasionally to see where they are and what's coming. It isn't pretty. So writers try to prepare only a minimal outline of their remarks, knowing that details can be added during the speech itself. Another big mistake.