‘Out of sight, out of mind’, or, ‘What you don’t see (, i.e. hear, feel, smell etc., or imagine internally) doesn’t worry you.’
All my physical and emotional responses are activated (and made actual) by what I see in my brain (and vice-versa). In other words, the datum that is presented to the brain (i.e. to my blind Biological Navigation System, short Bio-Nav (auto-pilot if you must) via an external stimulus or from memory determines my physical responses; and my physical actions determine my mental responses. Moreover, only one datum can be processed by my brain (which operates as a quantum, i.e. step by step processor) at any one time (instant/moment).
The rest is obvious.
By presenting (or holding present) one (i.e. any) datum to my brain (as Bio-Nav) I momentarily flood (i.e. fill, ergo fulfil) my brain with that datum. By so doing I exclude all other data. The presented datum determines the state of my brain which in turn determines, as an ideo-motor response, the state of my bio-physical state. That, of course, is the essential understanding of both Yoga and Buddhist meditation, meaning, what my brain visualises that I feel/am.
So, if I think beer, noodles or a holiday in Spain my brain, operating as blind navigation system, will drive me (or make me desire, so the Buddha) towards beer, noodles or a holiday in Spain. And if I don’t, it won’t.
If I flood my brain with worry (i.e. distress) neutral forest data I can’t but stop worrying and my whole body-mind system returns to peace (i.e. homeostasis). If I flood my brain with mobile phone texting, or the response to any other activity, for instance, cycling, hill running, binge drinking or immersing myself in a Singing Bowl sound bath, I can’t but stop worrying about my actual problems, both positive and negative. (Hence the widespread and increasing addiction to mobile phone activity).
In essence, flooding the brain with a single idea washes it clean of all other ideas leaving the brain and the body to respond to only the one idea.
Thus, ‘What I think, that I become!’ … ‘I am (my true self) what I thought!’