Habits are self-reinforcing. The actions taken now affect not only today, but also future. Once we form a habit, its repeated nature will set you on an auto-pilot mode to the destination.
Therefore, habits are self-fulfilling prophecies: once you set the direction, the mere belief will eventually lead to that very predicted outcome. This mechanism implies that, to develop a habit, we may first talk ourselves into believing its rosy outcome. Then the very belief will set offs chain of repeated actions fulfilling that prediction.
[Seven Mile Bridge (featured in movie True Lies), Key West, FL, March, 2015]