So I was great, and increased more than all that were before me in Jerusalem: also my wisdom remained with me.(Ecclesiastes 2:9)

And whatsoever mine eyes desired I kept not from them, I withheld not my heart from any joy; for my heart rejoiced in all my labour: and this was my portion of all my labour.(Ecclesiastes 2:10)

Then I looked on all the works that my hands had wrought, and on the labour that I had laboured to do: and, behold, all was vanity and vexation of spirit, and there was no profit under the sun.(Ecclesiastes 2:11)

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.

Then I saw that wisdom excelleth folly, as far as light excelleth darkness.(Ecclesiastes 2:13)

The wise man's eyes are in his head; but the fool walketh in darkness: and I myself perceived also that one event happeneth to them all.(Ecclesiastes 2:14)

Then said I in my heart, As it happeneth to the fool, so it happeneth even to me; and why was I then more wise? Then I said in my heart, that this also is vanity.(Ecclesiastes 2:15)

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Ecclesiastes 2:12 - Cross Reference

The thing that hath been, it is that which shall be; and that which is done is that which shall be done: and there is no new thing under the sun. (Ecclesiastes 1:9)

I applied mine heart to know, and to search, and to seek out wisdom, and the reason of things, and to know the wickedness of folly, even of foolishness and madness: (Ecclesiastes 7:25)

And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit. (Ecclesiastes 1:17)