'Folly' in the Bible

And I give my heart to know wisdom, and to know madness and folly: I have known that even this is vexation of spirit;

I have sought in my heart to draw out with wine my appetite, (and my heart leading in wisdom), and to take hold on folly till that I see where is this -- the good to the sons of man of that which they do under the heavens, the number of the days of their lives.

And I turned to see wisdom, and madness, and folly, but what is the man who cometh after the king? that which is already -- they have done it!

And I saw that there is an advantage to wisdom above folly, like the advantage of the light above the darkness.

I have turned round, also my heart, to know and to search, and to seek out wisdom, and reason, and to know the wrong of folly, and of foolishness the madness.

Dead flies cause a perfumer's perfume To send forth a stink; The precious by reason of wisdom -- By reason of honour -- a little folly!

The beginning of the words of his mouth is folly, And the latter end of his mouth Is mischievous madness.