Ecclesiastes 5:17-18

17All of his life he also eats in darkness [cheerlessly, without sweetness and light], with great frustration, sickness, and anger.

18Behold, here is what I have seen to be good and fitting: to eat and drink, and to find enjoyment in all the labor in which he labors under the sun during the few days of his life which God gives him—for this is his [allotted] reward.