Found in 2 comments on Hacker News
smallegan · 2011-06-03 · Original thread
The Practicing Mind "Bringing Discipline and Focus Into Your Life" by Thomas Sterner

http://www.amazon.com/dp/0977657205

tjstankus · 2009-07-25 · Original thread
The spirit and message of this post remind me of one of the best books I've read: The Practicing Mind. (http://www.amazon.com/Practicing-Mind-Bringing-Discipline-Fo...)

I fight myself over striving for perfection constantly. When I get closer to the "practicing" mindset I'm happier and more productive. It takes discipline and constant reminding, but it's worth the struggle.