Business is business. 
公事公办。

By doing we learn. 
经一事，长一智。

By falling we learn to go safely.
 吃一堑，长一智。

By other's faults, wise men correct their own. 
他山之石，可以攻玉。

Better good neighbours near than relations far away. 
远亲不如近邻。

Between two stools one falls to the ground. 
脚踏两头要落空。

Big mouthfuls ofter choke. 
贪多嚼不烂。

 Birds of a feather flock together. 

物以类聚，人以群分。

Bite off more than one can chew. 
贪多咽不下。

Bitter pills may have wholesome effects. 
良药苦口利於病。

Blood is thicker than water. 
血浓於水。

Bread is the staff of life. 
民以食为天。

Burnt child dreads the fire. 
一朝被蛇咬，十年怕井绳。

Business before pleasure. 
事业在先，享乐在后。