Because if you're trying to write and you have unlimited time, you can procrastinate an unlimited account, but if you have limited time, you rush to the page trying to get something down in the little bit of fragment of time that you have, and you may write a great deal that way.
“I've never been very successful in a monogamous relationship, but I'm looking forward to the day when I can assume that responsibility.”
“I find you write with one person in mind. Usually for me that one person is my wife, because she's my most severe critic and understands best what I'm trying to do.”