Let bygones be bygones.

既往不昝。

A wise man cares not for what he cannot have.

智者不作非凡之想。

Let beggars match with beggars.

龙配龙,凤配凤。

Lend your money and lose your friend.

赔了夫人又折兵。

Least said, soonest mended.

多说反坏事。

No pains, no gains.

没有付出就没有收获。

Life is half spent before we know what it is.

等到认识人生,已经一半过去了。

Newspapers are the world's mirrors.

报纸是世界之镜。

Art is long, but lift is short.  

人生有涯,而学无涯。

Nightingales will not sing in a cage.

夜莺困笼不唱歌。