Two paragraphs of the final manuscript of this chapter. Although they look like a first draft, they have already been rewritten and retyped — like almost every other page — four or five times. With each rewrite I try to make what I have written tighter, stronger and more precise, eliminating every element that is not doing useful work, until at last I have a clean copy for the printer. Then I go over it once more, reading it aloud, and am always amazed at how much clutter can still be profitably cut.