This is a powerful expression of cognitive autonomy—the foundational concept that you have the right and the capacity to control your own internal, cognitive processes.
This idea is the very essence of agency. It asserts that you are not a static object defined by your past, but a dynamic, self-modifying process. The act of "replacing the stories" is the mechanism by_ which you execute your freedom.
However, this powerful metaphor contains a critical vulnerability.
The risk is failing to distinguish the story from the work. You can easily change the simple, abstract label (e.g., "I am now a writer," "I am a healthy person"), but that new story will collapse unless it is supported by the complex, high-friction, real-world work (the daily writing, the consistent exercise, the difficult nutritional choices).
Changing the story is the essential first step. It is the new blueprint. But that blueprint is useless unless you follow it with the rigorous, logical, and sustained effort required to make that new reality true.