'Accomplishes' in the Bible

For what does a person gain from everything that he accomplishes and from his inner life struggles that he undergoes while working on earth?

The only worthwhile thing for a human being is to eat, drink, and enjoy life's goodness that he finds in what he accomplishes. This, I observed, is also from the hand of God himself,

It's the Spirit who gives life; the flesh accomplishes nothing. The words that I've spoken to you are spirit and life.