A book that furnishes no quotations is no book—it is a plaything. Next to the originator of a good sentence is the first quoter of it. How frequently the mere purchase of a book is mistaken for the appropriation of its contents.

I began this as a reply to Timothy Morton's extremely helpful comment on entropy in letters and words (following Shannon, whom I've used elsewhere in discussing the editing of Shakespeare). In fact all the comments were wonderful, so let me say thanks. Thanks!

I've been thinking about quotations out of context for a long time: probably since Ray Bradbury made me fall in love with Yeats without my reading a word of him except Bradbury's quotations in title and epigraph. When such quotations are great -- and really that's the most fundamental reason for wanting to quote, or at least for remembering quotations, getting them by heart -- there are two ways they can be great: