知彼知己,百戰不殆 [ㄓ ㄅㄧˇ ㄓ ㄐㄧˇ , ㄅㄞˇ ㄓㄢˋ ㄅㄨˋ ㄉㄞˋ; zhi1 bi3 zhi1 ji3 , bai3 zhan4 bu4 dai4] Knowing the enemy and yourself will get you unscathed through a hundred battles (idiom, from Sunzi's Art of War). ◄ ►