There's a Line Between Revision and Fretting

Those [paragraphs] that need reworking I do as long as I can. I mean I’ve revised six times, seven times, thirteen times. But there’s a line between revision and fretting, just working it to death. It is important to know when you are fretting it; when you are fretting it because it is not working, it needs to be scrapped.

TONI MORRISON