万物之灵
thelords of creation

万事开头难
Everything is difficult at the start

万无一失
not a single miss in a thousand times.

落井下石
to hit a person when he's down

隔墙有耳
Pitchers have ears; walls have ears.

开夜车/挑灯夜战
Burn the midnight oil.

开诚布公
He always opens his heart to his spouse when he has a problem.

盗亦有道
Dog does not eat dog.

善有善报
One kindness is the price of another.

损人利己
to enrich oneself at others expense  

小Car笔记:
spouse:配偶 【例句】He never mentioned his spouse. 他从来不提自己的妻子。
enrich oneself:自肥,利己

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