idiom
A friend to all is a friend to none
那些试图取悦每个人的人最终可能没有取悦任何人
Meaning
Someone who tries to please everyone may end up pleasing no one
Example
He is friendly to everyone, but he has no real close friends because **a friend to all is a friend to none**.
他对每个人都很友好,但他没有真正亲近的朋友,因为**每个人的朋友是没有朋友的**。