for their own good

[jasonlulu_2000]

She wants to say to him what she has learned,none of it in class. Some women are born stupid,and some women are too smart for their own good. Some women are born to give ,and some women only know how to take. Some women learn who they want to be from their mothers,some who they don’t want to be. Some mothers suffer so their daughters won’t. Some mothers love so their daughters won’t.

What does the underlined sentence mean? Can a native teacher help paraphrase it?

Thanks!

Jason