Ecclesiastes 2:22-25

For what does a man get from all his labor and from the striving and sorrow of his heart with which he labors under the sun? For all his days his work is painful and sorrowful; even at night his mind does not rest. This too is vanity (worthless). There is nothing better for a man than to eat and drink and assure himself that there is good in his labor. Even this, I have seen, is from the hand of God. For who can eat and who can have enjoyment without Him?