Oh, it was Ernest Hemingway in A Moveable Feast. "The only kind of writing is rewriting."
Ernest Hemingway and everyone else quoted in this article.
I particularly like this one by Vladimir Nabokov: "I have rewritten -- often several times -- every word I have ever published. My pencils outlast their erasers."
I'm not even to the point of re-writing words, I'm re-doing the outline itself, because the rising action rose and fell and rose and fell and ... you get it. There was a conflict, and while it was realistic, it didn't build steadily. When I finish revising a section of the outline I rewrite those chapters.
I bet this is the place when people give up. I am not giving up.