He becomes the victim of his own destructive plans and the violence he intended for others falls on his own head.

What benefit do people get from all the effort which they expend on earth?

What does a man acquire from all his labor and from the anxiety that accompanies his toil on earth?

and also that everyone should eat and drink, and find enjoyment in all his toil, for these things are a gift from God.

A song of ascents, by Solomon. If the Lord does not build a house, then those who build it work in vain. If the Lord does not guard a city, then the watchman stands guard in vain.

I have seen personally what is the only beneficial and appropriate course of action for people: to eat and drink, and find enjoyment in all their hard work on earth during the few days of their life which God has given them, for this is their reward.

A man who is all alone with no companion, he has no children nor siblings; yet there is no end to all his toil, and he is never satisfied with riches. He laments, “For whom am I toiling and depriving myself of pleasure?” This also is futile and a burdensome task!