Ecclesiastes 8:15-17

So I commended enjoyment, because a man has nothing better under the sun than to eat, drink, and be merry; for this will remain with him in his labor all the days of his life which God gives him under the sun. When I applied my heart to know wisdom and to see the business that is done on earth, even though one sees no sleep day or night, then I saw all the work of God, that a man cannot find out the work that is done under the sun. For though a man labors to discover it, yet he will not find it; moreover, though a wise man attempts to know it, he will not be able to find it.