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!
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.