Seth Godin is wicked smart and he's demonstrated it again in a post called The Marketer's Attitude. I'd only add one thing to the title, The Marketer's or Entrepreneur's attitude . . . now I'll admit I'd add a few things to the Entrepreneur's attitude as I'm sure Seth would too, but this serves as a good starting point.
If you don't read Seth's blog daily you are leaving money on the table. And, if you want to listen to a great interview with Seth, Dave Lakhani and John Jantsch (Duct Tape Marketing Author) you'll find it here.