知己知彼，百战不殆
zhī​jǐ​zhī​bǐ​bǎi​zhàn​bù​dài

know yourself and know your enemy

  1. 知己知彼 zhī​jǐ​zhī​bǐ
    to know oneself and know the enemy
    (idiom) To be familiar with one's own strengths and weaknesses as well as those of the opponent; originally from 孙子兵法 sūn​zǐ​bīng​fǎ
  2. ， bǎi
    non-Chinese
  3. 百战不殆 百戰不殆 bǎi​zhàn​bù​dài
    to win every battle
    to emerge victorious from every fight; to come through a hundred battles unscathed. This idiom originally comes from the 孙子兵法 sūn​zǐ​bīng​fǎ and is often preceded by the phrase 知己知彼 zhī​jǐ​zhī​bǐ