魔高一丈，道高一尺 mó gāo yī zhàng, dào gāo yī chǐ

mó gāo yī zhàng, dào gāo yī chǐ phrase the devil is ten foot tall, virtue one foot; It takes constant vigilance to stave off evil.
Domain: Proverb 谚语
Notes: (CC-CEDICT '魔高一丈，道高一尺')