I heard an interview on the radio today that was really Interesting.  The subject was a fellow who translates Haruki Murakami works into other languages.  The interviewer asked him, "When do you know that a creative work is done?  That is, when do you stop fiddling with your translations and adjusting and fixing things?"

The translator quoted Murakami as saying, "When you get to the point that all you're doing is going through the manuscript and taking out Commas and then going back through and putting them back in.  That's when you know you're done."

I thought that was interesting...  in a martial arts sense...