Influential people aren't buffeted by the latest trend or by public opinion. They form their opinions carefully, based on the facts. They're more than willing to change their mind when the facts support it, but they aren't influenced by what other people think - only by what they know.
People with a growth mindset believe that they can improve with effort. They outperform those with a fixed mindset, even when they have a lower IQ, because they embrace challenges, treating them as opportunities to learn something new.
Common sense would suggest that having ability, like being smart, inspires confidence. It does, but only while the going is easy. The deciding factor in life is how you handle setbacks and challenges. People with a growth mindset welcome setbacks with open arms.