Ecclesiastes 8:16-17 King James 2000 (KJ2000)

16. When I applied my heart to know wisdom, and to see the business that is done upon the earth: (for also there is one who neither day nor night sees sleep with his eyes:)

17. Then I beheld all the work of God, that a man cannot find out the work that is done under the sun: because though a man labors to seek it out, yet he shall not find it; yea moreover; though a wise man thinks to know it, yet shall he not be able to find it.

Ecclesiastes 8