He who makes no mistakes makes nothing.

想不犯错误，就一事无成。

A good medicine tastes bitter.

良药苦口，忠言逆耳。 

Cheerful company shortens the miles.

旅有好旅伴，不觉行程远。

He is lifeless that is faultless.

只有死人才不犯错误。

A new broom sweeps clean.

新官上任三把火。 

He is a good friend that speaks well of us behind our backs.

背后说好话，才是真朋友。

Beauty,unaccompanied by virtue,is as a flower without perfume.

美而无德犹如花之无香。

Hope for the best, but prepare for the worst.

抱最好的愿望，做最坏的打算。

Necessity and oportunity may make a coward valient.

初试不成功，努力勿懈怠。

Say not all that you know,believe not all that you hear .

莫道全所知，莫信全所闻。