Every successful piece of nonfiction should leave the reader with one provocative thought that he or she didn't have before. Not two thoughts, or five - just one. So decide what single point you want to leave in the reader's mind.
William ZinsserWriting organizes and clarifies our thoughts. Writing is how we think our way into a subject and make it our own. Writing enables us to find out what we know-and what we don't know-about whatever we're trying to learn.
William ZinsserThere's not much to be said about the period except that most writers don't reach it soon enough.
William Zinsser