Ecclesiastes 8:16-17

When I applied mine heart to know wisdom, and to see the business that is done upon the earth: (for also {there is that} neither day nor night seeth sleep with his eyes:) 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 labour to seek {it} out, yet he shall not find {it}; yea further; though a wise {man} think to know {it}, yet shall he not be able to find {it}.