Ecclesiastes 8:16-17
16When I agave my heart to know wisdom and to see the endeavor which has been done on the earth (even though one bnever sees sleep with his eyes day or night), 17and I saw every work of God, I concluded that aman cannot find out the work which has been done under the sun. Even though man should seek laboriously, he will not find it out; and bthough the wise man should say, “I know,” he cannot find it out.