From the BBC: Point of View: The art of the diary
"... Perhaps Virginia Woolf, whose own diaries are exhilaratingly wonderful, sums up best what a diary should be.
"What sort of diary should mine be," she writes. "Something loose knit but not slovenly, so elastic that it will embrace anything solemn, slight or beautiful that comes into my mind. I should like it to resemble some deep old desk or capacious hold-all in which one flings a mess of odds and ends without looking them through. I should like to come back after a year or two and find that the collection had sorted itself and refined itself and coalesced..."