"Our debt to tradition through reading and conversation is so massive, our protest so rare and insignificant-and this commonly on the ground of other reading and hearing-that in large sense, one would say there is no pure originality. All minds quote. Old and new make the warp and woof of every moment. There is no thread that is not a twist of these two strands. By necessity, by proclivity, and by delight, we all quote. It is as difficult to appropriate the thoughts of others as it is to invent."