彼を知り己を知れば、百戦殆からず、彼を知り己を知れば百戦殆からず
かれをしりおのれをしれば、ひゃくせんあやうからず
karewoshirionorewoshireba、hyakusen'ayaukarazu
JMdict entry #2429140
- expressions (phrases, clauses, etc.) proverb if you know your enemy and know yourself, in a hundred battles you will never be defeated; know your enemy