This verse notes these “street smart/prudent” folks “act with knowledge” — suggesting they’ll tend to make good choices.
On the other hand, while those men and women are making some appropriate decisions, “fools expose their folly.”
“Fools” aren’t people who are mentally deficient. The Biblical term represents moral deficiency.
Admittedly, no one’s perfect — including “prudent” people — but “fools” are those who’ve made a conscious decision to go their own way. And, thinking like that, it’s not hard to see how they’ll end up speaking and acting according “their folly.”
Once we realize where our own best thinking always gets us…we can decide to start thinking differently. And, if we think differently, we will begin to feel, speak and act differently.
“Act with knowledge” vs. “expose their folly.” Sound like a no-brainer to me!