One time someone asked an author to identify a very scribbled paragraph in his work. He said, "When I wrote these sentences, only the monk Huai Su was with me, and only he knows it now. ". The writer means:. ["Most people don't understand cursive.", "Huai Su's cursive script.", 'The writer has forgotten the content of this passage, and it is difficult to identify his handwriting.', 'What writers never write lightly.']