魔高一丈,道高一尺 [ㄇㄛˊ ㄍㄠ ㄧ ㄓㄤˋ , ㄉㄠˋ ㄍㄠ ㄧ ㄔˇ; mo2 gao1 yi1 zhang4 , dao4 gao1 yi1 chi3] the devil is ten foot tall, virtue one foot (idiom); It takes constant vigilance to stave off evil. ◄ ►