知彼知己,百戰ä¸æ®†ï¼›ä¸çŸ¥å½¼è€ŒçŸ¥å·±ï¼Œä¸€å‹ä¸€è² ï¼›ä¸çŸ¥å½¼ï¼Œä¸çŸ¥å·±ï¼Œæ¯æˆ°å¿…殆
It is said that if you know your enemies and know yourself, you will not be imperiled in a hundred battles; if you do not know your enemies but do know yourself, you will win one and lose one; if you do not know your enemies nor yourself, you will be imperiled in every single battle.
~ Art of War, Ch. 3, the last sentence, by Sun Tzu
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