I think I know; this always comes up in discussions of time management, self-improvement, etc. One argument says "if it's valuable to you, you'll make time for it." Which is true as it stands, and can be inspirational - it can be extended to "make time for what truly matters to you." The reality is that it's harder to break bad habits and develop good ones than most people think. I like to say "people can change, but most won't". Some of PG's essays follow along these lines, especially when he uses analogies of running (I think "Hardest Lessons for Startups to Learn" was one prime example).