《明史·列传·卷四十》
他七十岁时，一再请求退休，皇上不许。
年七十，再乞休。不许。
When he turned seventy, he begged to retire on several occasions, but the emperor refused to allow it.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 年七十，再乞休。不许。 [/INST] When he turned seventy, he begged to retire on several occasions, but the emperor refused to allow it.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 年七十，再乞休。不许。
user
When he turned seventy, he begged to retire on several occasions, but the emperor refused to allow it.
assistant