Ecclesiastes 2:12

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

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

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

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.

Treasury of Scripture Knowledge

Summary

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.

Even that which hath been already done

Bible References

I turned

Ecclesiastes 1:17
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
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.

Even that which hath been already done

Ecclesiastes 2:25
For who can eat, or who can have enjoyment, more than I?

American Standard Version Public Domain