William Carew Hazlitt, The Book-Collector
“ Looking at the imperfect and unconsecutive condition in which much of our most precious early literature has been received by us, we are apt to reflect to how narrow and close an accident we owe two classes of existing remains: the unique book and the unique fragment. Of course to term a volume or production unique is a perilous business; the bookseller and the auctioneer may do so ex officio; an inexperienced amateur may resort to the term as a pleasant and harmless self-deception; but no responsible writer or critic dares to pronounce anything whatever unique without an emphatic caveat. ”
