If you write with a pencil you get three different sights at it to see if the reader is getting what you want him to. First when you read it over; then when it is typed you get another chance to improve it, and again in the proof. Writing it first in pencil gives you one-third more chance to improve it. That is .333, which is a damned good average for a hitter.
— Ernest Hemingway, on why he always wrote his first drafts by hand with pencil and paper.