Rest in Peace, Frank Pierson.
“At each level you reach, you have to tear up what you have done before, which cost an enormous amount of psychological and emotional energy. That makes the process of screenwriting very, very difficult. And I don’t know any screenplay that I have ever worked on where I did not go through ten to twelve or sometimes sixteen drafts before I showed it to anybody.”
[Quote via The Poor Dancing Girl She Won't Dance Again]