It’s a neuro linguistic programming technique.
I’ve also only read about 1/3rd of it.
I’d sum it up “whether you think you can or think you can’t you are probably right”
It’s about telling your inner doubting voice that you can and that the consequences of getting it wrong are tolerable/acceptable and that you understand your doubting self has valid concerns but that OK you’ve considered that and think the risk is worth taking.
if you need the science to back up the arguement read the book if you get the concept above, go find “Bounce: The Myth of Talent and the Power of Practice” by Matthew Syed. I found that book much more interesting.
You must have been reading a different book because your summary of what its about is so far off the mark its hilarious.
Mind you, its not surprising I suppose, you admit to only reading a third of it. I’m surprised you would be able to make an adequate summary of any book at that point.