Ecclesiastes 3:9-13

What profit hath he that worketh in that wherein he laboreth? I have seen the travail which God hath given to the sons of men to be exercised therewith. He hath made everything beautiful in its time: also he hath set eternity in their heart, yet so that man cannot find out the work that God hath done from the beginning even to the end. I know that there is nothing better for them, than to rejoice, and to do good so long as they live. And also that every man should eat and drink, and enjoy good in all his labor, is the gift of God.