知
己
知
彼

Word Definition - 知己知彼

zhī jǐ zhī bǐ know yourself, know your enemy (idiom, from Sunzi's "The Art of War" 孫子兵法|孙子兵法[sūn zǐ bīng fǎ])

Individual Character Details

知 zhī
己 jǐ
知 zhī
彼 bǐ