Kurt Vonnegut Jr. said this quote

“ Sentences spoken by writers, unless they have been written out first, rarely say what writers wish to say. Writers are unlucky speakers, by and large, which accounts for their being in a profession which encourages them to stay at their desk for years, if necessary, pondering what to say next and how best to say it. Interviewers propose to speed up this process by trepanning writers, so to speak, and fishing around in their brains for unused ideas which otherwise might never get out of there. Not a single idea has ever been discovered by means of this brutal method-- and still the trepanning of authors goes on every day.I now refuse all those who wish to take the top off my skull yet again. The only way to get anything out of a writer's brains is to leave him or her alone until he or she is damn well ready to write it down. ”