The first duty of the novelist is to entertain. It is a moral duty. People who read your books are sick, sad, traveling, in the hospital waiting room while someone is dying. Books are written by the alone for the alone.
Donna TarttFor me - showing a half-finished manuscript is tricky. Just as a bird will get spooked and abandon her eggs if some outside party comes around and makes too much noise or pokes around the nest too intrusively - well, that's what it's like for me if I show work too early and I get a lot of editorial suggestions at the wrong time.
Donna Tartt