《诗》云:“如切如磋,如琢如磨。”(《卫风.淇奥》)切、磋、琢、磨,本来指器物加工的工艺名称。《尔雅.释器》曰:“骨谓之切,象谓之磋,玉谓之琢,石谓之磨。”郭璞注:“皆治器之名也。”汉王充《论衡.量知》亦曰:“骨曰切,象曰磋,玉曰琢,石曰磨;切磋琢磨,乃成宝器。”后来人便常 “Poetry” cloud: “cut off such as learning, such as Zhuozhu mill.” (“Wei Feng Qi Austrian”) Cut, study, Zhuo, grinding, originally referred to the processing of artifacts craft name. “Er Ya. Interpreter” said: “bone that the cut, as the so-called discussion, jade that cut, stone that the mill.” Note: “Governor of the name also.” Han Wang Chong “on the balance. The amount of knowledge ”also said:“ Bone said cut, like saying study, Yu said Zhuo, stone said grinding; learn pondering, is a treasure. ”Later people often