Self talk is the ongoing conversation that you hold with yourself (or with the many parts of yourself.)
Some self talk is just muttering, other self-talk is planning, still other self-talk is worry.
Some self-talk is trivial, while other self-talk is important.
So, why is some self-talk important?
There is a part of yourselves that is listening to your self-talk.
Worse, that part of your consciousness is collecting your self-talk and cataloging it as beliefs.
And, it is this relationship to beliefs that makes self-talk so important.
This is because beliefs act as filters, and because beliefs act like magnets.
So, to live the life of your dreams, you need to take charge of your self-talk so that your beliefs respond correctly.
Beliefs "chunk" information, and make daily decisions easier to make while your mind is on autopilot. This decreases stress and filters relevant sensory information so that you know what you are perceiving.
Beliefs also filter relevant information so that you receive what you believe, and miss other information that would change, modify, alter, or refine your belief.
The adage "Seeing is believing" and the reverse "Believing is seeing" its opposite are both true.
Belief is different than "faith", although most people use the terms to refer to the same concept.
"Faith" is the "evidence of things unseen".
Confusing these term leads to barriers in living your dreams. The mechanism where mistaking faith and belief creates barriers is self-talk and affirmation are incorrectly used to modify faith. Of course, this does not work, and since only beliefs are affected by the self-talk and affirmations.