《资治通鉴·唐纪·唐纪三十》
春秋时代的子路为他的姐姐服丧，到期还不除去丧服，孔子说： 这是先王制定的礼仪，必须遵守，作为仁孝的人都是不忍心这样做的。 
昔子路有姊之丧而不除，孔子曰： 先王制礼，行道之人，皆不忍也。 
In the Spring and Autumn period, Zilu mourned for his elder sister, and when the mourning period was over, he did not remove the mourning clothes. Confucius said, "This is a ritual established by our former sovereigns, and it must be followed. Benevolent and filial people would not bear to do so." 
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 昔子路有姊之丧而不除，孔子曰： 先王制礼，行道之人，皆不忍也。  [/INST] In the Spring and Autumn period, Zilu mourned for his elder sister, and when the mourning period was over, he did not remove the mourning clothes. Confucius said, "This is a ritual established by our former sovereigns, and it must be followed. Benevolent and filial people would not bear to do so." </s>
Identify the key themes in this Classical Chinese text and explain them in English: 昔子路有姊之丧而不除，孔子曰： 先王制礼，行道之人，皆不忍也。
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In the Spring and Autumn period, Zilu mourned for his elder sister, and when the mourning period was over, he did not remove the mourning clothes. Confucius said, "This is a ritual established by our former sovereigns, and it must be followed. Benevolent and filial people would not bear to do so."
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