Self control is important to any writer. Just keeping butt-in-chair (thanks, Uncle Jim over at Absolute Write water cooler) is a fundamental but difficult task. Doesn't the bathroom need cleaning, re-grouting, maybe new tiles? Procrastination.
But this article suggests self-control is strengthened when we remind ourselves of our core principle--why we're doing something, why it's of value, why we're of value. Read the short post. Self-affirmation is important.