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Meaning of 知己知彼,百战不殆

Lookup via: Pinyin | Radicals
知 zhī 己 jǐ 知 zhī 彼 bǐ , , 百 bǎi 战 zhàn 不 bù 殆 dài (Trad.: 知己知彼,百戰不殆)
know yourself and know your enemy, and you will never be defeated (idiom, from Sunzi's "The Art of War" 孙子兵法 )