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Mozi said: To accomplish anything whatsoever one must have standards. None have yet accomplished anything without them. The gentlemen fulfilling their duties as generals and councillors have their standards. Even the artisans performing their tasks also have their standards. The artisans make square objects according to the square, circular objects according to the compasses; they draw straight lines with the carpenter's line and find the perpendicular by a pendulum. All artisans, whether skilled or unskilled, employ these five standards. Only the skilled workers are accurate. Though the unskilled labourers have not attained accuracy, yet they do better by following these standards than otherwise. Thus all artisans follow the standards in their work. 1. 也 : Inserted. 孫詒讓《墨子閒詁》
2. 衡以水， : Inserted. 吳毓江《墨子校注》
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