《资治通鉴·宋纪·宋纪十五》
虞愿又说： 这是尧用来教他儿子丹朱的玩艺儿，不是人主所应该嗜好的。 
愿又曰： 尧以此教丹硃，非人主所宜好也。 
Yu Yuan said again: "This is a toy that Yao used to teach his son Danzhu. It is not something that a sovereign should indulge in."
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 愿又曰： 尧以此教丹硃，非人主所宜好也。  [/INST] Yu Yuan said again: "This is a toy that Yao used to teach his son Danzhu. It is not something that a sovereign should indulge in."</s>
Identify the key themes in this Classical Chinese text and explain them in English: 愿又曰： 尧以此教丹硃，非人主所宜好也。
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Yu Yuan said again: "This is a toy that Yao used to teach his son Danzhu. It is not something that a sovereign should indulge in."
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