Ecclesiastes 1:13 in the World English Bible
I applied my heart to seek and to search out by wisdom concerning all that is done under the sky. It is a heavy burden that God has given to the sons of men to be afflicted with.
Context
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.