I think this is an important post. Likely to be lost amongst all the 'noise' of getting stuff done.
My view is that purpose often becomes very opvious once you 'clear the calculator' - which is precisely what GTD leads toward.
Certainly having a purpose and vision to leverage makes it far easier to stay focused, say no and make sensible choices about what to do next.
Does anyone have any resources / ideas on moving to this level?