《韩非子·难一》
但他之所以一定主张采用欺诈手段，因为这是战争计谋。
然必曰 出于诈伪 者，军旅之计也。
But the reason why he insisted on using deception was because it was a war strategy.
<s>[INST] Explain the meaning of this Classical Chinese passage in English: 然必曰 出于诈伪 者，军旅之计也。 [/INST] But the reason why he insisted on using deception was because it was a war strategy.</s>
Explain the meaning of this Classical Chinese passage in English: 然必曰 出于诈伪 者，军旅之计也。
user
But the reason why he insisted on using deception was because it was a war strategy.
assistant