Hugh Prather wrote in Notes to Myself:
“If the desire to write is not accompanied by actual writing, then the desire is not to write”
I disagree with Prather, because like Seth Godin related, the desire should be: "[...] marketing and idea spreading, working every day to deliver your message with authority [via writing]."
19. Writing a book is a tremendous experience. It pays off intellectually. It clarifies your thinking. It builds credibility. It is a living engine of marketing and idea spreading, working every day to deliver your message with authority. You should write one.
Writing is difficult, and one will have a difficult time finishing a book if he or she isn't energized by the idea of spreading and delivering a dear message.
It's similar to reading a non-engaging book, because it's difficult to read a book that isn't delivering anything - not even entertainment.
And any writer, like Nabokov, who relates that he or she doesn't write to spread an idea is (possibly) a...