The mind runs toward whatever pictures it is fed, and it cannot tell a vividly held image from an event. A man who rehearses his failures all day builds a self-image sized for failure, and the automatic machinery inside him steers to match it. The list here works like a set of blueprints handed to that machinery: the honest, the fair, the clean, the lovely, the things worth praising.
Attention is the raw material of the picture a person carries of himself. When the imagination dwells on what is decent and admirable, those images sink below the surface and begin to shape how he moves and speaks. A life grows toward the pictures it keeps. What fills the mind's screen, day after day, is what a person slowly becomes.