'Folly' in the Bible

And I set my mind to know wisdom and to know madness and folly; I realized that this also is striving after wind.

I explored with my mind how to stimulate my body with wine while my mind was guiding me wisely, and how to take hold of folly, until I could see what good there is for the sons of men to do under heaven the few years of their lives.

So I turned to consider wisdom, madness and folly; for what will the man do who will come after the king except what has already been done?

And I saw that wisdom excels folly as light excels darkness.

I directed my mind to know, to investigate and to seek wisdom and an explanation, and to know the evil of folly and the foolishness of madness.

folly is set in many exalted places while rich men sit in humble places.

the beginning of his talking is folly and the end of it is wicked madness.