If you think about it you can see the common root word in “folly NASB” (200) and “foolishness KJV”. The common idea is being a fool. As I looked through different commentaries I thought what Adam Clarke had to say was interesting.
“Fool is here taken for a wicked man, who is not only evil in his actions, but every thought of his heart is evil, and that continually. A simple thought about foolishness, or about sin itself, is not sinful; it is the purpose or device, the harbouring evil thoughts, and devising how to sin, that is criminal”Adam Clarke was a contemporary of our Founding Fathers.
So? Where your heart is, thus goes your planning. Make sure your heart is right.