There is no doubt that the mind is powerful, just as we are capable of creating great things when we believe them possible, we are also capable of slowing our growth if we do not have confidence in our abilities, just look at the recent Paralympic Olympics to see what we are capable of doing if our mind does not have limitations.
I love the example you gave about the Paralympics. I watched the competition and I understood that as long as the mind is aligned positively, even disability will be turned to ability.
Thanks a lot buddy