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" One insurance executive I worked with described the major benefit he derived from implementation of this system: “Previously I would just tell everyone, ‘Sure, I’ll do it,’ because I didn’t know how much I really had to do. Now that I’ve got the inventory clear and complete, just to maintain my integrity, I have had to say, ‘No, I can’t do that, I’m sorry.’ The amazing thing is that instead of being upset with my refusal, everyone was impressed with my discipline! "
― David Allen , Getting Things Done: The Art of Stress-Free Productivity
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" Ask any psychologist how much of a sense of past and future that part of your psyche has, the part that was storing the list you dumped: zero. It's all present tense in there. That means that as soon as you tell yourself that you should do something, if you file it only in your short-term memory, there's a part of you that thinks you should be doing it all the time. And that means that as soon as you've given yourself two things to do, and filed them only in your head, you've created instant and automatic stress and failure, because you can't do them both at the same time. If you're like most people, you've probably got some storage area at home—maybe a garage that you told yourself a while back (maybe even six years ago!) you ought to clean and organize. If so, there's a part of you that likely thinks you should've been cleaning your garage twenty-four hours a day for the past six years! No wonder people are so tired! And have you heard that little voice inside your own mental committee every time you walk by your garage? "Why are we walking by the garage?! Aren't we supposed to be cleaning it!?" Because you can't stand that whining, nagging part of yourself, you never even go in the garage anymore if you can help it. "
― David Allen , Getting Things Done: The Art of Stress-Free Productivity