《韩非子·难三》
所以说，用一句话回答就可以使三个人没有祸患，也就是说要了解下情。
故曰：一对而三公无患，知下之谓也。
Therefore, it is said that answering three people with one sentence can make them free of disasters, that is, to understand the real situation.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 故曰：一对而三公无患，知下之谓也。 [/INST] Therefore, it is said that answering three people with one sentence can make them free of disasters, that is, to understand the real situation.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 故曰：一对而三公无患，知下之谓也。
user
Therefore, it is said that answering three people with one sentence can make them free of disasters, that is, to understand the real situation.
assistant