Ecclesiastes 8:14-17

14There is another enigma that occurs upon the earth: there are righteous people who are requited according to the work of the wicked, and there are wicked people who are requited according to the work of the righteous. I said, “This also is meaningless.”

15So I recommend enjoyment, because there is nothing better for humanity under the sun except to eat, drink and enjoy it. So this joy will accompany him in his labor all the days of his life that God gives him under the sun.

16When I applied my heart to know wisdom and to observe the activity that is done upon the earth (his eyes not seeing sleep either day or night),

17then I saw all the work of God. No one can comprehend the work that is done under the sun. Despite all human efforts to seek it out, no one comprehends. Even if a wise person claims to know, he cannot really comprehend.