Ecclesiastes 4:7-8

7And I returned and saw vanity under the sun.

8There is one [alone] and without a second; also he hath neither son nor brother: yet is there no end of all his labour, neither is his eye satisfied with riches, and [he saith not], For whom then am I labouring, and depriving my soul of good? This also is vanity and a grievous occupation.