Ecclesiastes 1:12-14 King James Version (KJV)

12. I the Preacher was king over Israel in Jerusalem.

13. And I gave my heart to seek and search out by wisdom concerning all things that are done under heaven: this sore travail hath God given to the sons of man to be exercised therewith.

14. I have seen all the works that are done under the sun; and, behold, all is vanity and vexation of spirit.

Ecclesiastes 1