This term has a two-fold meaning. Firstly, it refers to the need to rid an essay of banal wording. Secondly, it encourages authors to discard mediocre, derivative ideas when writing. It is a term raised by the Tang Dynasty man of letters Han Yu (768-824) about prose writing. Han emphasized that essays should be written in an innovative way. He guarded against stereotyped expression and argument and opposed any rigid convention. This view echoed the idea of "writing to convey Dao" put forward by Han Yu during the Classical Prose Movement he led, a movement which aimed to abandon rhythmical prose characterized by parallelism and ornateness in favor of ancient prose of the Han Dynasty.