Sixth, the Commentary on the Tao Te Ching , by Wu Chʽêng ( AD 1249⁠–⁠1333) of Lin Chʽuan . This has been of the highest service to me. Wu Chʽêng was the greatest of the Yüan scholars. He is one of the literati quoted from occasionally by Chiao Hung in his Wings ; but by no means so extensively as Julien supposes ( “Observations Détachées” p. xli