Solomon teaches that investing all of yourself into job is meaningless. Although God says we should do our best at work it should not be our daily focus.
Where are you today? Are you in pursuit of happiness, wealth, popularity? Or are you searching for God?
Many people believe that in order to get ahead in life one needs to have connections. And it was true for Solomon in spiritual sense. For him, it was not about what you know, but Who you know.