Ecclesiastes 1:17; Ecclesiastes 2:12; Ecclesiastes 7:25; Ecclesiastes 9:3

Ecclesiastes 1:17

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

Ecclesiastes 2:12

12 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?

Ecclesiastes 7:25

25 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.

Ecclesiastes 9:3

3 This is an evil in all that is done under the sun, that there is one fate for all men. Furthermore, the hearts of the sons of men are full of evil and insanity is in their hearts throughout their lives. Afterwards they go to the dead.