Ecclesiastes 3:9-11

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

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

¹¹He 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.