The Futility of Solitary Labor

Ecclesiastes 4:7-8

And I have turned, and I see a vain thing under the sun:

There is one, and there is not a second; even son or brother he hath not, and there is no end to all his labour! His eye also is not satisfied with riches, and he saith not , `For whom am I labouring and bereaving my soul of good?' This also is vanity, it is a sad travail.