William Zinsser said this quote

The final advantage is the same that applies in every other competitive venture. If you would like to write better than everyone else, you have to want to write better than everyone 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 are not as high. Too many writers are browbeaten into settling for less than their best.