Ecclesiastes 3:9-11

⁹What profit hath he that worketh in that wherein he laboreth?

¹⁰I have seen the travail which God hath given to the sons of men to be exercised therewith.

¹¹He 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.