futile-endeavor

So I loathed all the fruit of my effort, for which I worked so hard on earth, because I must leave it behind in the hands of my successor. Who knows if he will be a wise man or a fool? Yet he will be master over all the fruit of my labor for which I worked so wisely on earth! This also is futile! What does a man acquire from all his labor and from the anxiety that accompanies his toil on earth? For all day long his work produces pain and frustration, and even at night his mind cannot relax! This also is futile!There is nothing better for people than to eat and drink, and to find enjoyment in their work.