Ecclesiastes 2:12

I went again in search of wisdom and of foolish ways. What can the man do that comes after the king? Only what he has already done.

Ecclesiastes 1:17

I gave my heart to know wisdom and to know madness and folly. I know that this also is a striving after wind.

Ecclesiastes 7:25

I applied my heart to know, and to search, and to seek out wisdom. I looked for the explanation, and to know the wickedness of folly, even of foolishness and madness.

Ecclesiastes 1:9-10

That which has been is that which will be. That which has been done is that which will be done. There is nothing new 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
I gave my heart to know wisdom and to know madness and folly. I know that this also is a striving after wind.
Ecclesiastes 7:25
I applied my heart to know, and to search, and to seek out wisdom. I looked for the explanation, and to know the wickedness of folly, even of foolishness and madness.

Even that which hath been already done

Ecclesiastes 2:25
After all, who eats and who drinks better than I?