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

Ecclesiastes 1:17

17 And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit.

Ecclesiastes 2:12

12 And I turned myself to behold wisdom, and madness, and folly: for what can the man do that cometh after the king? even that which hath been already done.

Ecclesiastes 9:3

3 This is an evil among all things that are done under the sun, that there is one event unto all: yea, also the heart of the sons of men is full of evil, and madness is in their heart while they live, and after that they go to the dead.