Not a phrase someone expects to hear - Marilyn Monroe, wise? Really? Wasn't she just a vapid sex-pot?
I'm reading a biography right now, and no, she really wasn't. She was constantly searching information, knowledge. Reading classic literature, studying art. It's interesting.
Wise words of today are: "I can be smart when it's important, but most men don't like it." (spoken as Lorelei Lee in Gentlemen Prefer Blondes - 1952)
And now you'd suggest that she didn't actually speak them, they were scripted for her. Except that it was Marilyn's idea to add them to the movie. They weren't originally scripted. And truer words have probably never been spoken. And, it seems she based her entire persona on them.
It's sad that 59 years later it's still the same. Men/boys do not like smart women in general. Are they threatened by it? Do they just like to feel intellectually superior? Who knows but them. And they're not telling.
So, we learn to either play stupid, or suffer their intolerance of us. It's a petty game, really. But even as young girls we know we have to learn how to play it. Because even now, there's judgement if a woman can't get a man.
And a smart girl, even a pretty one, can rarely get a man as easily as a pretty dumb girl.