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郎天亦伯云
This passage introduces a core principle from Hanfeizi, a key pre-Qin thinker, on how to verify ideas and opinions. The core idea is simple: to confirm whether an assessment is correct, one must use observation, comparison, and cross-checking from multiple perspectives (heaven, earth, objects, and humans). Hanfeizi emphasized focusing on practical effects—only ideas proven to work in real life are truly valid. He warned that blindly accepting something without verification is foolish. In short, this method teaches us to test claims through evidence and real-world results, rather than relying on assumptions. It reflects an early form of critical thinking in traditional Chinese philosophy.

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