If you would like to write better than everybody else, you have to want to write better than everybody else. You must take an obsessive pride in the smallest details of your craft. And you must be willing to defend what you've written against the various middlemen - editors, agents and publishers - whose sights may be different from yours, whose standards not so high.
William ZinsserOne of underestimated tasks in nonfiction writing is to impose narrative shape on an unwieldy mass of material.
William ZinsserNever say anything in writing that you wouldn't comfortably say in conversation. Be yourself when you write. If you're not a person who says 'indeed' or 'moreover,' or who calls someone an individual ('he's a fine individual'), please don't write it.
William Zinsser