For what hath man of all his labour, and of the vexation of his heart, wherein he hath laboured under the sun? For all his days are sorrows, and his travail grief; yea, his heart taketh not rest in the night. This is also vanity. There is nothing better for a man, than that he should eat and drink, and that he should make his soul enjoy good in his labour. This also I saw, that it was from the hand of God.
I have seen the travail, which God hath given to the sons of men to be exercised in it. He hath made every thing beautiful in his time: also he hath set the world in their heart, so that no man can find out the work that God maketh from the beginning to the end. I know that there is no good in them, but for a man to rejoice, and to do good in his life. And also that every man should eat and drink, and enjoy the good of all his labour, it is the gift of God. I know that, whatsoever God doeth, it shall be for ever: nothing can be put to it, nor any thing taken from it: and God doeth it, that men should fear before him.
(Ecclesiastes 2: 22-24, 3: 10-14)