Ecclesiastes 8:16-17 NIV

16 When I applied my mind to know wisdom1 and to observe man's labor on earth2--his eyes not seeing sleep day or night--

References for Ecclesiastes 8:16

17 then I saw all that God has done.3 No one can comprehend what goes on under the sun. Despite all his efforts to search it out, man cannot discover its meaning. Even if a wise man claims he knows, he cannot really comprehend it.4

References for Ecclesiastes 8:17