A hedge between keeps friendship green君子之交淡如水。

 

a friend is not so soon gotten as lost 交友慢，失友快。 

 

a friend to everybody is a friend to nobody 广交友，无深交。

 

a friend without faults will never be found 没有缺点的朋友是永远找不到的。

 

a good book is a best friend who never turns his back upon us 一本好书，莫逆之交。