'Task' in the Bible

I decided to carefully and thoroughly examine all that has been accomplished on earth. I concluded: God has given people a burdensome task that keeps them occupied.

For to the one who pleases him, God gives wisdom, knowledge, and joy, but to the sinner, he gives the task of amassing wealth -- only to give it to the one who pleases God. This task of the wicked is futile -- like chasing the wind!

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!