A bad beginning makes a bad ending.

不善始者不善终。

A bird in the hand is worth than two in the bush.

一鸟在手胜过双鸟在林。

A close mouth catches no flies.

病从口入。

A constant guest is never welcome.

常客令人厌。

Actions speak louder than words.

事实胜于雄辩。

Adversity makes a man wise, not rich.

逆境出人才。

A fox may grow gray, but never good.

江山易改，本性难移。

A friend in need is a friend indeed.

患难见真情。

A good beginning is half done.

良好的开端是成功的一半。

A leopard cannot change its spots.

积习难改。

A man can do no more than he can.

凡事都应量力而行。

A miss is as good as a mile.

失之毫厘，差之千里。