知己知彼,百戰不殆 [ㄓ ㄐㄧˇ ㄓ ㄅㄧˇ , ㄅㄞˇ ㄓㄢˋ ㄅㄨˋ ㄉㄞˋ; zhi1 ji3 zhi1 bi3 , bai3 zhan4 bu4 dai4] Know yourself and know your enemy, and you will never be defeated (idiom, from Sunzi's Art of War 孫子兵法[ㄙㄨㄣ ㄗˇ ㄅㄧㄥ ㄈㄚˇ; sun1 zi3 bing1 fa3]). ◄ ►