"Decayed wood cannot be carved."
Interestingly, Confucius was famously known for his hostility towards midday rest, as manifested in the ‘Gongye Chang’ episode of The Analects of Confucius. Zai Yu, one of Confucius’ favorite disciples, had the gift of the gab. One day, Confucius noticed that Zai Yu did not show up in his class and so he sent someone to check out his whereabouts. The student returned to report that Zai Yu was sleeping like a log in his room. “Decayed wood cannot be carved,” Confucius sighed in great disappointment.