Ecclesiastes 4:4, 8

And I saw that all toil and all achievement spring from one person’s envy of another. This too is meaningless, a chasing after the wind.

There was a man all alone; he had neither son nor brother. There was no end to his toil, yet his eyes were not content with his wealth. “For whom am I toiling,” he asked, “and why am I depriving myself of enjoyment?” This too is meaningless— a miserable business!