It is now (1949) sixteen years since my first book was published, and about twenty-one years since I started publishing articles in the magazines. Throughout that time there has literally been not one day in which I did not feel that I was idling, that I was behind with the current job, and that my total output was miserably small. Even at the periods when I was working ten hours a day on a book, or turning out four or five articles a week, I have never been able to get away from this neurotic feeling that I was wasting time. I can never get any sense of achievement out of the work that is actually in progress, because it always goes slower than I intend, and in any case I feel that a book or even an article does not exist until it is finished. But as soon as a book is finished, I begin, actually from the next day, worrying because the next one is not begun.
~ George Orwell