" For whom does the writer write? The question poses itself most simply in the case of the diary-writer or journal-keeper. Only very occasionally is the answer specifically no one, but this is a misdirection, because we couldn't hear it unless a writer had put it in a book and published it for us to read. Here for instance is diary-writer Doctor Glas, from Hjalmar Soderberg's astonishing 1905 Swedish novel of the same name:
Now I sit at my open window, writing - for whom? Not for any friend or mistress. Scarcely for myself, even. I do not read today what I wrote yesterday; nor shall I read this tomorrow. I write simply so my hand can move, my thoughts move of their own accord. I write to kill a sleepless hour. "

― Margaret Atwood , Negotiating with the Dead: A Writer on Writing