Ecclesiastes 3:9-11

Young's Literal Translation

⁹ What advantage hath the doer in that which he is labouring at?

¹⁰ I have seen the travail that God hath given to the sons of man to be humbled by it.

¹¹ The whole He hath made beautiful in its season; also, that knowledge He hath put in their heart without which man findeth not out the work that God hath done from the beginning even unto the end.