Ecclesiastes 4:8

4:8 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!

Ecclesiastes 6:12

6:12 For no one knows what is best for a person during his life –

during the few days of his fleeting life –

for they pass away like a shadow.

Nor can anyone tell him what the future will hold for him on earth.