Ecclesiastes 8:15-17

Young's Literal Translation

¹⁵ And I have praised mirth because there is no good to man under the sun except to eat and to drink, and to rejoice, and it remaineth with him of his labour the days of his life that God hath given to him under the sun.

¹⁶ When I gave my heart to know wisdom and to see the business that hath been done on the earth, (for there is also a spectator in whose eyes sleep is not by day and by night),

¹⁷ then I considered all the work of God, that man is not able to find out the work that hath been done under the sun, because though man labour to seek, yet he doth not find; and even though the wise man speak of knowing he is not able to find.