Ecclesiastes 1:13

13 I applied my mind to study and to explore by wisdom all that is done under the heavens. What a heavy burden God has laid on mankind!

Read Ecclesiastes 1:13 Using Other Translations

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.
And I applied my heart to seek and to search out by wisdom all that is done under heaven. It is an unhappy business that God has given to the children of man to be busy with.
I devoted myself to search for understanding and to explore by wisdom everything being done under heaven. I soon discovered that God has dealt a tragic existence to the human race.