Cross reference
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 done long ago.
Ecclesiastes 1:17
17 And I applied my heart to know wisdom, and to know madness and folly: I perceived that this also was a striving after wind.
Ecclesiastes 7:25
25 I turned about, and my heart `was set' to know and to search out, and to seek wisdom and the reason `of things', and to know that wickedness is folly, and that foolishness is madness.
Ecclesiastes 1:9-10
9 That which hath been is that which shall be; and that which hath been done is that which shall be done: and there is no new thing under the sun.
10 Is there a thing whereof it may be said, See, this is new? it hath been long ago, in the ages which were before us.