自相矛盾

Pronunciation: zì xiāng máo dùn Literal meaning: Spear shield contradict self

Origin & Usage

This idiom originates from a famous logical paradox in the Han Feizi, where a merchant claimed to have a spear (矛) that could pierce anything and a shield (盾) that could block anything - creating a self (自) contradicting (相) claim. The story became a classic example in Chinese logical discourse, used to expose inconsistent arguments. During the Song Dynasty, it became a standard term in philosophical debates. Modern usage extends beyond logic to any self-defeating behavior or inherently inconsistent policy, from corporate strategies to personal life choices.

When to Use

Situation: The policy's conflicting requirements made implementation impossible

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