All writers are vain, selfish, and lazy, and at the very bottom of their motives there lies a mystery. Writing a book is a horrible, exhausting struggle, like a long bout of some painful illness. One would never undertake such a thing if one were not driven on by some demon whom one can neither resist nor understand. For all one knows that demon is simply the same instinct that makes a baby squall for attention. And yet it is also true that one can write nothing readable unless one constantly struggles to efface one's own personality. Good prose is like a windowpane.
Inspiration can be a wonderful thing, but it can also be quite fickle.. If you want to be able to call on inspiration reliably then you need to work on it with regularity. Someone once said that if you only go out with a bucket to collect water when it's raining, sometimes you'll get water. But if you go out with your bucket every day, even when it's not raining, sometimes you'll catch unexpected rain. And also, a strange thing may happen: that the very act of going out with your bucket may actually provoke such rain.