Management gurus study what makes people successful. The goal is to learn and share the lessons, so we can all be more effective. Throughout the years, while there have been a variety of lessons and techniques identified, Focus and Discipline consistently appear.
It is not that successful people never get off-track. They (we) all do. It is that they know what their Focus is supposed to be, and they have the Discipline to ask if they are indeed focused! (Harvard Business Review, What to Ask the Person in the Mirror, reprint R0701H)
The same is true with our walk with God. In Chapter 13 we see the One Thing we need to do to stay connected with God!