RE self dialogue: I think it is also self-reinforcing in a positive way. "I am competent and capable of this" is certainly less distracting internal dialogue than "maybe I'm not smart enough" to children. I believe most adults eventually get better at ignoring this type of thing altogether, since it isn't really useful or productive.
Parenting philosophy rooted in growth mindset advocates less for "I am smart and therefore I can do this" but rather "the hard work that it will take to do this is worth investing, and failures along the way are opportunities to learn rather than judgments of whether I'm good enough or should continue."
