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Mencius said: “Even with Li Lou’s sharp eyes and Gongshu Ban’s (Lu Ban’s) superb craftsmanship, without compass and square, one cannot draw perfect circles or squares. Even with Shi Kuang’s acute hearing, without the six pitch standards, one cannot tune the five notes correctly.”
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When the crown prince of Teng (later Duke Wen of Teng) was traveling to Chu, he passed through Song and went to see Mencius.
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Mencius said: “Zilu was delighted whenever someone pointed out his faults. Yu the Great would bow in gratitude whenever he heard wise and virtuous words.”
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8.20Shun had five ministers and all that is under Heaven was well ruled.