Frequently, too, pausing in the middle of a sentence whose commencement he had apparently forgotten, he seemed to be listening in the deepest attention, as if either in momentary expectation of a visiter, or to sounds which must have had existence in his imagination alone.
それに、話すことを忘れてしまったように途中で口をつぐんでしまうことも度々あり、彼の心の中だけにしか存在しない音か誰かを待ち望んでいるような、心の奥深くでじっと聞き耳をたてているような、そんな感じがするのです。 - Edgar Allan Poe『約束』