彼かれを知しり己おのれを知しれば、百戦殆ひゃくせんあやうからず

expression

know your enemy and know yourself, and you will never be defeated in a hundred battles

Proverb from Sun Tzu's The Art of War. Used to emphasize the importance of understanding both one's own strengths and the opponent's situation before engaging in any conflict.

• 「彼かれを知しり己おのれを知しれば、百ひゃく戦せんあやうからず」という言こと葉ばは、ビジネスでもよく引いん用ようされる。

  The saying 'If you know your enemy and know yourself, in a hundred battles you will never be defeated' is often quoted in business as well.