Found this great article on Seth Godin's blog, and it makes sense to me, becuase I am never done.
Done. By Seth Godin
What happens when your inbox is empty?
What happens when all the agenda items and all the incoming emails are cleared?
Time to go home. A job well done. Congratulations, you earned your paycheck.
This is the factory mindset that has been drilled into us since kindergarten. You get assignments, you do your best, and you finish them.
It is at this point that we draw the line between workers and entrepreneurs, between people who work in marketing and marketers.
The challenge is NOT to empty your inbox. The challenge is not to get your boss to tell you what to do.
The challenge is to ask a two part question: What next? What now?
Asking is the hard part.