dào gāo yī chǐ, mó gāo yī zhàng
道 高 一 尺， 魔 高 一 丈

The law is strong, but the outlaws are ten times stronger.

解释 ( paraphrase )
道行增高一尺，魔怪跟着增高一丈。
这条谚语来源于佛教，用来告诫修行的人，道行的增高很不容易，而受到魔怪的诱惑丧失道行却很容易。 引申的意思是：成为一个好人需要经过很长时期的努力，变成一个坏人非常的快。

This proverb comes from Buddhism. It stresses that it is difficult to achieve goodness, which is easy to lose when the devil tempts us. The extended effort to become a good man, but one can easily learn to be a bad one.

道行：僧道修行的功夫。
The attainments of a Taoist priest.

造句 ( example )
道高一尺，魔高一丈，网络反黑任重道远。