Do not have too many irons in the fire.
贪多嚼不烂。

Do not change horses in mid-stream.
别在河流中间换马。

Difficult the first time, easy the second.
一回生，二回熟。

Desire has no rest.
人的欲望无止境。

Custom makes all things easy.
习惯成自然。

Do one thing at a time, and do well.
一次只做一件事，做到最好！

Clumsy birds have to start flying early.
笨鸟先飞。

Business is business.
公事公办。

Bad luck often brings good luck.
塞翁失马，安知非福。

Behind the mountains there are people to be found.
天外有天，山外有山。