“My assumption, always, is that everyone knows everything I know AND MORE. Rephrase. Everyone who is interested in the kinds of thing that interest me knows everything I know AND MORE. If they're not interested they don't know but don't want to. So there's no point in mentioning things that strike me as interesting, unless a) these are events in the last, say, 5 minutes (so those disposed to be interested might not be au fait or b) I'm up for proselytizing (those not disposed to be interested might be with enough encouragement).”
See? Helen DeWitt even knows more than I do about why I am such an infrequent blogger.