【若要人不知，除非己莫为】〖ruò yào rén bù zh，chú fi j mò wéi〗[you don't want people to know what you do, don't do it!; If you don't want people to know, you'd better not do it; If you want to keep sth. from people, don't do it; The only way to prevent people from knowing is not to do it]

若是做坏事，

要遭众讽议。

人前背后骂，

不得其好死。

知错才能改，

除害即兴利。

非请莫入内，

己溺如己饥。

莫敢仰视怕，

为恶必自毙。

要想人家不知道，除非自己不去做。指干了坏事终究要暴露。Don't want others to know, unless you don't do yourself. Refers do bad thing must be exposed after all.